mtg kaya cards Kaya, Geist Hunter (Borderless) [Innistrad: Crimson Vow] Exile target nonland permanent with converted mana cost 1 or less Kaya, 14 cards | Magic:

Rowan, Scion of War Rowan, Scion of War is practically a combo piece, and one of the best X-spell commanders in Magic

Weatherlight Compleated is a possible exception

Other High-Power Creatures The first thing Id start looking for with a Ryu deck is high-power creatures that you want to attack with, and luckily, Boros has no shortage of goodies in that department

Cards like that are the exception to the rule, though

Wrenn and Realmbreakers +1 loyalty ability turns a land you control into a 3/3 Elemental creature with vigilance, hexproof, and haste until your next turn

This question is extremely relevant now that Treasure tokens are everywhere because they can be considered for affinity and the mana they produce