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.
Near Mint - $1.30
Near Mint Non-English - $1.30
Lightly Played - $1.20
Lightly Played Non-English - $1.20
Played - $0.90
Played Non-English - $0.90
Heavily Played - $0.80
Heavily Played Non-English - $0.80
Damaged - $0.70
Damaged Non-English - $0.70