Deathmatch Arena

Legendary

Go again

Heroes can attack any opponent.

When a hero deals lethal damage to another hero, they create Gold tokens equal to the number of heroes who started this game.

Rulings

From the Heavy Hitters release notes

All players can target any opposing hero when targeting them for an attack in multiplayer games (not just left and right). This does not allow a player to target anything else controlled by that hero (allies, auras with spectra etc.)
If you kill another hero with anything other than damage (i.e. life loss), Deathmatch Arena does not trigger and you do not create any Gold tokens.
If you control Deathmatch Arena and you are dealt lethal damage by an opposing hero in a multiplayer game, that hero does not create any Gold tokens. Before players remaining in the game receive priority, players that are dealt lethal damage lose the game, clear all objects they control, and remove all objects they own from the game. This includes any unresolved triggered-layers created by Deathmatch Arena as they would be controlled by the player who lost.
If you control the Deathmatch Arena that is owned by another player, and that player is dealt lethal damage in a multiplayer game, the hero who dealt the lethal damage will create the Gold token(s). Before players remaining in the game receive priority, players that are dealt lethal damage lose the game, clear all objects they control, and remove all objects they own from the game. As Deathmatch Arena was controlled by a different player than its owner when its owner was dealt lethal damage, its controller will put any unresolved triggered-layers created by Deathmatch Arena onto the stack to be resolved even though it no longer exists in the game.

Keyword notes

Go again - Go again allows multiple actions to be played in a turn when usually playing an action with use up your action point, and therefore end your turn. A card with go again gives the controller of that card or activated ability 1 action point when it resolves.

When an action with go again resolves, its controller gains 1 action point.
Multiple instances of go again on the same card or activated ability do not stack. If a card or activated ability has multiple instances of go again when it resolves its controller gains 1 action point only.
If an action with go again does not resolve, its controller does not gain 1 action point.
You cannot reveal a card with no to Belittle. The card must have a value to its power that is 3 or less. (0 is a value)