(Waterveil Slagheap isn't a spell.) At the beginning of your upkeep, Waterveil Slagheap deals 1 damage to target creature you control. Waterveil Slagheap is indestructible. (Destroy effects and lethal damage don't destroy it.) : Add  or to your mana pool. Sacrifice Waterveil Slagheap: Add  or to your mana pool.