This would probably be enough to make Katilda worthy of this list, but you can also pay six mana and tap them to put a +1/+1 counter on each creature you control
Baldemar Merlo [US] (7/5/2), Gholdengo ex/Lunatone 309
It aims to win by pushing for 20 Lore quickly, using Rubys explosive characters to apply pressure while Amber ensures your team stays consistent through steady synergy
Once the ability starts to resolve, players can't respond to the choice or take any actions until the ability finishes resolving
Because of this, most decks with this focus opt for extensive use of low-cost creatures, to boost their speed and generate critical mass of creatures in the first turns
While Edgar Markov's other ability definitely makes attacking with it successfully valuable, just casting Vampire spells in general will amass a favorable board state