Etherium-Horn Sorcerer

Cascade rewards you for casting the spell, and this Minotaur builds an engine out of that fact by handing you a way to cast it again. The bounce ability costs the same colors as the front half of its own mana value, so every recast triggers a fresh cascade off a six-cost spell: exile until you hit a nonland card that costs less, cast it free, repeat as long as your mana holds. Most cascade cards are one-shot value; the payoff fires when the spell is cast and then the card is a body. Pulling it back to hand for three mana plus the recast turns a single creature into a repeatable dig-and-cast loop, the depth of which is bounded only by how many spells under six mana sit in your deck and how much blue and red you can sink into the cycle. The 3/6 frame is almost incidental: a defensive enough body to sit back while you grind, wide enough toughness to survive the turns you spend recurring it rather than attacking. It is a rare instance of a cascade card designed to be cast more than once on purpose, and the whole line of play hinges on the arithmetic between its six-mana value and the smaller spells it is guaranteed to find underneath.