Invasion of Zendikar / Awakened Skyclave Invasion of Zendikar works because you would already pay to double Rampant Growth, then Awakened Skyclave is a decent size dork that scratches my itch for vigilant cards with a ability
This legendary god is great for creature-heavy decks because it triples your creature token output
When any source deals damage to you or a permanent you control, they will lose two life unless they can pay one generic mana
Nicol Bolas From the Vaults: Dragons Foil, $46.40 It is slightly ironic that Ugins archnemesis, Nicol Bolas follows Ugin on the list of most expensive dragons, although here we see Nicol Bolas in his younger, svelter, pre-planeswalker-spark Elder Dragon body
Just note that this checks on resolution, so if someone can remove your highest CMC creature, you will have to check what the new highest is when it resolves