Darkbeast Paarl

Menace. Whenever you draw or discard a card, it attacks or is attacked, Darkbeast Paarl gains an Electricity counter and deals 1 damage to a random opponent’s creature.

{t}: Draw a card, then discard a card.
{t}, {b}: Deal (X/2) damage to all opponents and their creatures, where X is its Electricity counters. Remove all counters, then it gets +X/+X. After combat, it loses this bonus.