Knuckles the Echidna

Whenever one or more creatures you control deal combat damage to a player, create a Treasure token. (It's an artifact with ", Sacrifice this token: Add one mana of any color.")

At the beginning of your end step, if you control five or more artifacts, transform Storm the Vault.

Haste

Whenever this creature deals combat damage to a player, that player creates a 0/1 colorless Goblin Construct artifact creature token with "This token can't block" and "At the beginning of your upkeep, this token deals 1 damage to you."

Double strike

Whenever another legendary creature you control enters, put a +1/+1 counter on Gimli.

Whenever Gimli deals combat damage to a player, create a Treasure token.

Menace

Whenever one or more creatures you control deal combat damage to a player, create a Treasure token.

Sacrifice a Treasure: Exile the top card of your library. You may play that card this turn.

Other Goblin creatures you control attack each combat if able.

At the beginning of combat on your turn, create a 1/1 red Goblin creature token with haste.

Whenever this creature attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

At the beginning of each player's end step, Mana Max deals damage to that player equal to the number of untapped lands they control.

Whenever a player loses one or more unspent mana, each of that player's opponents creates a Treasure token.