D/D) have some of their best engine pieces at Level 1, so having a generic option to include these Level 1 monster cards in a Pendulum summon is already a boon
Stupid casting cost
So keeping that in mind, here are the artifacts that dominated the game
Urzas abilities include reducing the cost of artifact, instant, and sorcery spells by two, creating two 1/1 creature tokens, and giving your artifacts and planeswalkers indestructible before destroying everything else.
This means you could play: one land, one enchantment, one artifact, one planeswalker, and one creature from your graveyard during each of your turns
Up to four players* can join in and play 12 minigames, like Egg Emergency and Delibird's Delivery