mtg 2021 collector booster box Commander Masters art cards found only in Collector Boosters core 2021 booster box Transparent

As for Pioneer, multicolor Greasefang, Okiba Boss shells sometimes play Mana Confluence already

As for standout creatures, both G'raha Tia, Scion Reborn and Estinien Varlineau provide massive power for casting noncreature spells, which can easily help you close out the game with even just a few triggers

Firdoch Core is a mana rock that triggers Sethron for a free token

Big Mother Mouser | 4 Colorless Mana Artifact Creature Robot This creature enters with two +1/+1 counters on it

Amazing design on this one, no additional notes

It's also a good resource for figuring out how much your cards are worth once the new set is out, so if you pull any Surge Foil cards in your booster pack preorders, you might suddenly find yourself with quite the nest egg