Kanira, Dinosaur Rider

Trample

Whenever Kanira, Dinosaur Rider enters the battlefield or attacks, you may pay {r/g}{r/w}{g/w}. If you do, create a 6/6 green dinosaur creature token with trample.

If you control 6 or more dinosaurs, at the beginning of your upkeep, you may pay {x}. If you do, you may create X 10/10 green dinosaur creature tokens.