X, Maverick Hunter

Side Dash-{u}{u}: Counter target spell or ability that targets X unless its controller pays {2}.

Charge Up-{g}{g}: Put a charge counter on X. X gets +1/+0 until end of turn.

X Buster-{r}{r}: If X's power is greater than target legendary creature's toughness, put a Defeated counter on that creature. Remove all charge counters from X.

X gets +1/+0 for each charge counter on it.
X has all activated abilities of cards with Defeated counters.