Zenkai Boost

Put a +1/+1 counter on target creature, then
double the number of +1/+1 counters on it.
Flashback {8}{g}{g}: This spell costs {x} less to
cast this way, where X is the greatest mana
value of a commander you own on the battlefield
or in the command zone. (You may cast this
card from your graveyard for its flashback cost.
Then exile it.)
"Oooo, sweet sciency magic! Naked time."