MacCrue

Every time this creature does damage, add a counter to MacCrue.
{1} Counter (While blocking): Negate any damage MacCrue would take.
{3} Counters: Tap an enemy creature.
{x} Counters: Remove all counters. Gain as many attacks as {x}. This effect gains no counters.
{6} Counters: Tap MacCrue. On your next turn, destroy all enemy creatures.