Primo, the Unbounded

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Primo enters as a 0/0 that scales to (2X)/2X with trample via its X cost, then generates a Fractal token matching the combat damage whenever a base-power-0 creature deals combat damage — including itself. This creates a self-reinforcing loop in counters/plus-one-counters shells: Primo swings, makes a token sized to the hit, that token can swing next turn to make another. Signature in counters-voltron and tokens-go-wide strategies in Simic; weak in control or aggro that can't capitalize on the attack-damage trigger chain.

• Primo's trigger requires 'base power 0' — this is the creature's printed power, not its power after counters. A Fractal token with 20 +1/+1 counters still has base power 0 and qualifies, enabling a self-sustaining combat-damage loop.

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• The token created by Primo's trigger also has base power 0, so it will itself trigger Primo's ability when it deals combat damage, creating an exponential snowball if left unchecked.

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• Casting Primo with X=0 produces a 0/0 that immediately dies unless there are other +1/+1 counter effects on the board (e.g., Hardened Scales, Doubling Season). Always invest mana in X or have counter support in play.

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• EDHREC rank: #9,977