Choose a creature card and/or a land card from among them
If you played without any ones or twos, you could guarantee your cascades always hit a Hypergenesis, which, despite having no cost, counts as zero cost for cascade
The way it synergizes with most of the creatures youd probably be running in spellslinger and prowess decks is definitely cool, and it can definitely make some cards a big threat by doubling their triggered abilities
Gwaihir the Windlord It makes sense that Gwaihir the Windlord would support all other bird creatures, but unfortunately all it does is give them vigilance
Rowan, Scion of War have its place in Commander, and Rowan, Scion of War pulls it off with aplomb, facilitating huge, potentially game-ending plays with ease