Pit of the Dragons

PvE {5}{t}: randomly create a 10/10 Mountain
Drake, an Ocean Drake, a Fire Drake, or an
Air Drake. Add a drake counter to this artifact, at
four counters exile Pit of the Dragons cards from
the game. Destroying a drake gives an emblem.
Mountain: "creatures you control have +0/+1"
Ocean: "gain 2 life at the start of each upkeep"
Fire: "creatures you control have +1/+0"
Air: "Creatures you control have haste"