Let's say Phoebe steals the text boxes of both Beast of Burden (power and toughness equal to the number of creatures on the battlefield) and Psychosis Crawler (power and toughness equal to the number of cards in your hand)
Convert to Slime gives you a three for one, and if you have Delirium, you get a fonky chonky Ooze for your troubles, making it a four for one, for five mana

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A lot of hearty debate
Neither Amass Orcs nor The Ring Tempts You are really a focus in this deck list, although both are certainly present to lend some Tolkien-specific vibes
Steward of the Harvest is the one thats sparked the most conversation, allowing you to turn all your creatures into Strip Mines or Gaea's Cradles, or just normal, humble mana dorks