Princess Power, the Amber/Sapphire combo, is very accommodating for more cautious play as you feel out the game
Though it is a seven mana cost, if you can get this beast on the battlefield, you can clean house without issue
17%inclusion 8%synergy 87 decks 498 decks Blind Obedience 15%inclusion 5%synergy 86 decks 560 decks Leyline of Hope 15%inclusion 11%synergy 83 decks 560 decks Trouble in Pairs 14%inclusion -1%synergy 79 decks 560 decks True Conviction 14%inclusion 5%synergy 77 decks 560 decks Friendly Neighborhood 12%inclusion 12%synergy 61 decks 491 decks Ghostly Prison 12%inclusion -9%synergy 69 decks 560 decks Sigarda's Splendor 12%inclusion 7%synergy 66 decks 560 decks Darksteel Mutation 11%inclusion -5%synergy 64 decks 560 decks Light of Promise 10%inclusion 5%synergy 54 decks 560 decks Smuggler's Share 9.3%inclusion 1%synergy 52 decks 560 decks Griffin Aerie 8.2%inclusion 6%synergy 46 decks 560 decks Origin of Spider-Man 7.7%inclusion 7%synergy 43 decks 560 decks Avengers Assemble

Blood Rite The Vampire deck stands out to me as the most relevant to supporting its corresponding type in a Cube, with meaningful support up and down the mana curve and notably offering some cheap white Vampires, which we really only see on Ixalan
Winter Moon is a lot fairer than Winter Orb, and though I think its pretty reasonable for mono-color decks to drop, the social contract is likely to keep it away from most tables
When you put a +1/+1 counter on Generous Pup, you get to put a +1/+1 counter on all your other creatures too