Rules Tip of the Day: When you change the target of a spell or ability, you must choose a legal target for this spell or ability.

Q: I attack my opponent with two creatures banded together (only one has banding) and one other creature not in the band. He blocks the creature with banding only. I then use the ability of Barbarian Warlord and target his blocking creature. What happens?

A: When blockers were declared, this lone blocking creature blocked both of the attacking creatures in the band. When the Warlord's ability resolves the targeted blocking creature will be removed from combat and the both creatures in the attacking band will become unblocked. If you choose to have this blocking creature block either creature in the band, then the entire band will become blocked again. If you choose to have this blocking creature block your other attacking creature, then both creatures in the attacking band will remain unblocked and deal combat damage to your opponent.

Q: What happens if I have Thrumming Stone in my Relentless Rats deck? Thrumming Stone is in play. I play Relentless Rats, resolve Ripple and reveal four more Relentless Rats. Now, each of those Relentless Rats will have Ripple 4, revealing 4 more cards and more Rats. When do the Rats come into play, and do I just reveal 16 more cards from my deck, or four each at four different times? And when do I reveal them, before or after the Rats come into play?

A: When the Ripple ability of the original Rat resolves, you reveal four more Rats. If you choose to play all four, then all four of these spells will go on the stack and their Ripple abilities will trigger. (These triggered abilities don't go on the stack quite yet.) Any cards you don't end up playing at this time will then go on the bottom of your library. Then, after this initial Ripple ability resolves, the Ripple ability from the newly played Rats will go on the stack.

Assuming that you do play all four, the stack will look like this; at the bottom of the stack you will have five Relentless Rat spells, and on top of that you will have four separate Ripple abilities. Then you resolve each Ripple ability one at a time, revealing four card, playing any matching cards if you want, and putting the remainder on the bottom of your library. Any Relentless Rats that are played will go on the stack on top of anything that has yet to resolve, and that ripple ability from any of these Rats will go on top of that.

Basically you work your way down slowly from top to bottom until everything on this stack resolves. The last thing on the stack to resolve will be the initial Rat you played.

Q: I attack with my Boreal Centaur and my opponent blocks with his Frost Raptor. I tap a Snow-Covered Forest to give my Centaur +1/+1. My opponent responds by playing Thermal Flux and making my snow-covered Forest non-snow. Does my Centaur die?

A: No. Mana abilities do not use the stack and cannot be responded to. As soon as activate the lands ability you have green snow mana. It does not matter that the land is no longer a snow permanent when the Boreal Centaur's ability resolves. The ability was activated and paid for, so your Centaur will get +1/+1.

Q: I was just wondering if Voidslime would be able to counter the Hellbent ability on Demonfire when the person playing Demonfire has no cards in hand at every point while Demonfire is on the stack.

A: No. The Hellbent ability is a static ability that applies as long as the controller of the Demonfire has no cards in hand. This ability cannot be countered by anything.

Q: In my main phase, I equipped a Grafted Wargear onto a Rabble-Rouser, and tapped it to boost attacking creatures by +4/+0 until end of turn. I then equipped another Rabble-Rouser, sacrificing the first, and gave attacking creatures +4/+0 again. Then, I equipped the Grafted Wargear on a Lightning Elemental and attacked. Would this Lightning Elemental would be a 15/1 haste creature? Or is this impossible, since, when the Rabble-Rouser's activated ability was used, no creatures were attacking at the moment?

A: The attacking Lightning Elemental will be a 3/1. The ability of Rabble-Rouse creates a continuous effect that is applied to all creatures that are attacking when the ability resolves. This continuous effect does not wait around and then get applied once creatures become attacking creatures. Both times when the Rabble-Rouser's ability has resolved in this situation there are no attacking creatures at this point, so nothing will get +4/+0.

Q: If I use a copy creature to copy a creature with Haunt, and then it's put into a graveyard, what happens?

A: The Haunt ability of this copy creature will trigger, go on the stack and you can target a creature in play with the ability. When this triggered ability resolves, you can remove this card left play as a copy from the game and Haunt the targeted creature. However, when removed from the game, this card is no longer a copy, so it does not have the Haunt ability. This means that when the Haunted creature goes to the graveyard, nothing will happen.

Q: I control a Crown of Convergence. If there is a Watchwolf on a top of my library will my Phytohydra get +2/+2, because it has the same colors?

A: No. Crown of Convergence only give at most +1/+1 to an individual creature. It does not matter if the revealed creature card shares two colors with a creature in play; the ability only cares that a color is shared, and not the number of colors that are shared.