King Rugotorix

Creatures you control have trample.
Whenever King Rugotorix attacks, reveal the top
card of your library. Creatures you control get
+X/+X until the end of turn where X is the the revealed cards converted cost. If a creature card is revealed this way put it onto the battlefield.
"We'll fight them hard, we'll fight them well, out on
these plains, we'll give them hell!"
-King Rugotorix