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
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
Kellogg, Dangerous Mind Kellogg, Dangerous Mind is one of those cards that just gives you enough rate so that its hard to ignore
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?