Knightmare Unicorn allows you to skip the draw phase, then for every co-linked Knightmare monster on your side of the field you can draw a card
Ureni is the Dragon-specific commander here, letting you take a peek at the top eight cards of your deck when he enters or attacks and snagging a Dragon creature from among those cards and putting it directly into play
Before that copied untap resolves (and whiffs, because Basalt Monolith is already untapped right now), tap Basalt Monolith to make three more colourless mana
To attempt to formalize things a bit further, the new Commander Panel introduced Game Changers, a list of cards whose inclusion marks a more powerful deck
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The -2 ability is absurd in Commander, where you only have to sacrifice two creatures to get rid of six