charizard pokemon card xy evolutions EX - art depiction of Charizard that makes it a true standout piece Pokemon XY - Evolutions M

The attack trigger's worded in such a way that you could give your teammate extra tokens when they attacked with Warriors

Equip Equipped creature gets +3/+3 and doesn't untap during its controller's untap step

The main things he has going for him are his Esper color identity, his consistent source of card draw, and his powerful (but expensive) activated ability

You dont really need any particular synergy for this to be worth slotting, but its a great way to fill your graveyard or pump sizing-sensitive cards like Alesha, Who Laughs at Fate

Both of these extended-art cards and the Commander slot above are treatments that can only be found in the Collector Booster