There's still lifegain stuff like Voice of the Blessed, five color things like The Kami War // O-Kagachi Made Manifest and all the domain cards from Dominaria United , heroic or aura type things with cards like Stormchaser Drake and Light-Paws, Emperor's Voice, good build around planeswalkers like Chandra, Dressed to Kill, fun graveyard stuff like Deathbonnet Sprout // Deathbonnet Hulk and Urborg Lhurgoyf, and big five color human stuff like Jodah, the Uniifer, as well as a bunch more
It evolves
Blue decks generally tend to have a lot of cards in hand, and dont need the help all that much, so youd likely be using this to help an opponent as much as yourself
Body Double if you mill opponents and Vizier of Many Faces if you mill yourself
Greninja (019/P-A) As a Stage 2 Pokmon, Greninja should make it through two evolutions (Froakie and Frogadier)
Card Name Vincent, Vengeful Atoner Mana Cost Type Legendary Creature Assassin Rarity Rare rules Text MenaceWhenever one or more creatures you control deal combat damage to a player, put a +1/+1 counter on Vincent