Superior Tactics

{w}{w}: Put a training counter on target creature.
Whenever a creature with a training counter on it
becomes blocked by a creature without a training
counter on it, the attacking creature's controller
may reveal a card from their hand. If the revealed
card has the same converted mana cost as either
the blocking creature's power or its toughness,
tap that creature and remove it from combat. If
no other creatures are blocking the attacking
creature, it is treated as though it wasn't blocked.