Some of these types of spells only let you choose one option, some you can choose a few options, and others let you choose as many options as youd like
Faeburrow Elder and Selvala, Explorer Returned are the most reliable of Selesnyas mana ramp options due to their low mana cost, but both also need to tap to generate mana, so youll need a way to give them haste to access their mana generation on the turn you play them
Since Ashcoat can both provide recurring value and act as a win condition, it has our vote as the best MTG Rat card in Commander
Five mana for a 4/4 plus a 2/2 is great
Buried Alive
While it looks like a marginally playable Draft uncommon with some minor synergies with enrage, this little 1/4 that could does a fantastic job at sniping some of the best aggressive cards in the format: The two most aggressive decks in the format, Mono-Red and Mardu Vehicles, all have highly powerful one-toughness creatures and can finish the game with an Unlicensed Disintegration if the opponent deals with the early threats and has to fight the heavier hitters with a creature of their own