Myr Collosis

+1: This card comes out with x loyalty counters. This plainswalker becomes a 5/5 defender until end of turn.
-3: Create a Equipment called mountain slicer. Equipped creature gains +1+1 for each mountain you control.
-10: This card becomes a 10/10 creature with haste, indestructible , and vigilance until your next upkeep.