Mossbridge Troll

Creature — Troll    (CMC:7)

If Mossbridge Troll would be destroyed, regenerate it. Tap any number of untapped creatures you control other than Mossbridge Troll with total power 10 or greater: Mossbridge Troll gets +20/+20 until end of turn.

123 SHM • ENJeremy Jarvis

™ & © 1993—2008 Wizards of the Coast

Legal in: Modern,Lorwyn-Shadowmoor Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Mossbridge Troll {5}{G}{G} Creature — Troll If Mossbridge Troll would be destroyed, regenerate it. Tap any number of untapped creatures you control other than Mossbridge Troll with total power 10 or greater: Mossbridge Troll gets +20/+20 until end of turn. 5/5

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View this MTG card on Gatherer

5/1/2008
The first ability essentially means that Mossbridge Troll always has a regeneration shield. It retains that shield even if it's used.
5/1/2008
The total power of the creatures you tap is checked only when you pay the cost. It doesn't matter if their power decreases, or if any of them have left the battlefield, by the time the ability resolves. Note that you may tap a Mossbridge Troll to help pay the cost of a different Mossbridge Troll's ability.

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