Aboroth

Cumulative upkeep-Put a -1/-1 counter on Aboroth. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
The Weatherlight banked sharply as the colossal beast rose up to crush the lone rider. “My bets on the dirt,” Gerrard said flatly.