Pesky Seedling

Killer - A unit with Killer can make one special attack directly against an enemy unit. This can be done the turn it's played, and can target any unit, regardless of Flying, Aegis, or other special abilities.

Summon - Does something when played

Corrupted - When a unit with Corrupted dies, a 0 strength Nightmare Shade is played. Shades have the ability to sacrifice themselves by paying their corrupted cost to play the starting unit's Summon ability. Shades lose 1 health at the end of each of your turns.