Yula, Lich of the Waves

First Strike
{3}, Sacrifice an Artifact: If {u} was spent to activate this ability, draw a card. If {b} was spent, target opponent discards a card. And if {r} was spent, Yula deals 2 damage to any target. (If multiple colors of mana were spent to pay costs for this ability, then all effects related to those colors of mana happen.)