Spartan Formation

At the beginning of your combat, reveal the top
card of your library. If it's a land card you may
put it into play. If it's a creature card, target
creature gains +X/+Y, where X & Y are the
creature's power and toughness respectively.
You may draw that card. If you don't, add {g/w}. This mana doesn't go away as steps and
phases end.
"Like the others, you were strong and swift and brave.
A natural leader." -Cortana