Rentag Brisleaxe, Boar Rider

Metalwork 3 — When you cast Rentag Brisleaxe,
Boar Rider you can sacrifice three Iron token to
have Rentag Brisleaxe, Boar Rider enter the battlefield with 4 2/2 boars with Defender.
When a friendly dwarf attacks you may tap an untapped boar you control to give it +2+2 until
end of turn.