pokemon card charizard evolution Mega Y ex (294/217) Colorless Explosion Y Discard 3 Energy from this Pokemon The newest Pokemon Card set

One for the 1v1 tables, for sure, this is quietly parked in a lot of Pioneer sideboards

That ability is "When the last defense counter is removed from this permanent, exile it, then you may cast it transformed without paying its mana cost." (4/14/2023) As a Siege enters the battlefield, its controller chooses an opponent to be its protector

You can't choose to enlist a creature later

(10/4/2019) Oko's second ability overwrites all colors and creature types the affected creature has

However, despite the lack of dragon cards, it has plenty of potential since it can repeat this effect as long as you keep drawing dragons