Cards just very very good in lands-matter decks
Heartfire Hero and Emberheart Challenger stand out as the mice that actually crack that top tier themselves, even in a deck not wholly designed around generating valiant triggers
While tutoring for any spell is primarily found in black cards, green has a significant number of cards that can tutor for creatures, often at a better rate than burning a Demonic Tutor on them
These cards are mechanically new and designed for Commander players
Whenever you gain life, you get a triggered ability that puts a +1/+1 counter on every creature you control
Would you play with a five-mana sorcery that read, Deal four damage to target creature, deal four damage to target player, and put a 4/4 flying dragon token into play tapped at the beginning of your next turn?