Marsh Titan

Whenever Marsh Titan attacks, you may pay {u}. If you do, choose one—
•Until end of turn, whenever this creature deals
combat damage to a player, draw a card.
•Destroy target creature with flying.
Whenever Marsh Titan blocks, you may pay {b}. If you do, choose one—
•Each opponent discards a card.
{bull}You gain 4 life.