one piece 12 booster box Royal Blood (OP-10) 12-Box Case Each Japanese One Piece Trading Card Game:

Note there are no restrictions here beyond that any counter counts from anyone's stuff, and then when it dies you can send them to a dork like your Commander or other stuff and then this is tucked

In The Lost Caverns of Ixalan , they went with three different ways to do it: Descend as a locked number (the descend X ability word), Descend as a scaling effect (the fathomless descent ability word), and Descend as an event (the descended keyword action)

Part combat trick, part Edgar-Markov-for-Humans-attack-trigger, Karvanista is an extremely solid card

If you control two, life gained while you have 5 or less life will be multiplied by 4