I really should have started thinking of good Return to Ravnica puns

Because I’m completely out of them right now, so onto the cards!

From the Mothership:

Necropolis Regent 3BBB
Creature – Vampire (M)
Flying Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it.

Angel of Serenity is a Gathering Magic spoiler. Counterflux came from Maro on Twitter and O-ring on steroids from TCGPlayer.

Wild Beastmaster 2G
Creature — Human Shaman (Rare)
Whenever CARDNAME attacks, each other creature you control gets +X/+X until end of turn, where X is CARDNAME’s power.

Here is the complete spoiler so far.