Junkyard Dog

MK I—{2}{g}{w}: This enchantment gains "Creatures you control get +0/+3". Activate only once.

MK II—{2}{b}{r}: This enchantment gains "Creatures you control get +3/+0". Activate only once and only after using the first ability.

MK III—{2}{u}{c}: This enchantment gains "Double the amount of any unspent mana you have". Activate only once and only after using the second ability.