cards like overrun mtg Cube: Top 10 Green Nature doesnt walk. What are some overrun-style effects

Felidar Umbra adds to the lifegain theme and can save your commander from destruction

A player loses the game after having been dealt 21 combat damage from any one of them, not from both of them combined (although your Background wont usually be a creature anyway)

Transforming Matzalantli doesn't cause it to leave the battlefield

The Beast, Deathless Prince is a 6/6 for 4 mana, and each time you steal a creature from an opponent and damage them, you get to draw a card

Think of it like a wordy mana dork that makes casting your most expensive spells easier, and you can always transform it back for a little more card selection