Criatura — Guerrero humano
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Incursión — Cuando el Jefe de hordas mardu entre al campo de batalla, si atacaste con una criatura este turno, pon en el campo de batalla una ficha de criatura Guerrero blanca 1/1.
Raid abilities evaluate the entire turn to see if you attacked with a creature. That creature doesn't have to still be on the battlefield. Similarly, the player, planeswalker, or battle it attacked doesn't have to still be in the game or on the battlefield.
Raid abilities care only that you attacked with a creature. It doesn't matter how many creatures you attacked with or which player, planeswalker, or battle those creatures attacked.