Bandai has been explicit about the design brief

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Slime Against Humanity will already be your primary source of creatures, and if you're willing to play without instants and nonland permanents, you'll be able to access Umori as a 101st card
Academy Rector (T1, Ext, S, Block) Ah, meat and potatoes time
Though exiling four cards a turn sounds like a lot of your deck gone, lets do the math: 100 cards, minus the commander, minus your opening seven-card hand, minus four draw steps by the time you cast this, leaves 88 cards in your library
Most rare cards will cost around $10