To triple a creature’s power, that creature gets +X/+0, where X is twice that creature’s power as the spell or ability that triples its power resolves. Similarly, an effect that triples a creature’s toughness gives it +0/+X, where X is twice that creature’s toughness. Tripling a creature’s power and toughness gives it +X/+Y, where X is twice its power and Y is twice its toughness.
April 27, 2018 · Dominaria
rule 701.11b not present in this release
September 30, 2016 · Kaladesh
If a creature instructed to fight is no longer on the battlefield or is no longer a creature, no damage is dealt. If a creature is an illegal target for a resolving spell or ability that instructs it to fight, no damage is dealt.
September 30, 2011 · Innistrad
To play a card means to play that card as a land or to cast that card as a spell, whichever is appropriate.
June 17, 2011 · Commander 2011
If the effect of a static ability regenerates a permanent, it replaces destruction with an
April 1, 2011 · Duel Decks: Knights vs. Dragons
If the effect of a static ability regenerates a permanent, it replaces destruction with an alternate effect each time that permanent would be destroyed. In this case, "Regenerate [permanent]" means "Instead remove all damage marked on [permanent] and tap it. If it's an attacking or blocking creature, remove it from combat."
February 4, 2011 · Mirrodin Besieged
If the effect of a static ability regenerates a permanent, it replaces destruction with an alternate effect each time that permanent would be destroyed. In this case, “Regenerate [permanent]” means “Instead remove all damage marked on [permanent] and tap it. If it’s an attacking or blocking creature, remove it from combat.”
October 1, 2010 · Scars of Mirrodin
If the effect of a static ability regenerates a permanent, it replaces destruction with an
February 1, 2010 · Worldwake
If the effect of a static ability regenerates a permanent, it replaces destruction with an alternate effect each time that permanent would be destroyed. In this case, "Regenerate [permanent]" means "Instead remove all damage marked on [permanent] and tap it. If it's an attacking or blocking creature, remove it from combat."