Anubis, Leader of Armies

+3: (Pay X life once, this is the number this ability abides by) Create X amount of 1/1 creatures, or 1 X/X creatures
-2: (Tap X mana per turn, this ability abides by X) X creatures you control get +1/+1, or 1 creature get's +X/+X
-13: (X is equal to double your opponents life, this ability may only be used once) Anubis is an X/X indestructible creature with haste for 1 turn