The classic method is to use cost-reducers like Goblin Electromancer, Helm of Awakening, Semblance Anvil or the Medallion cycle
The first is mobilize, the Mardu mechanic, which is a creature mechanic that triggers when a creature with mobilize attacks, creating a number of 1/1 red Warrior creature tokens that enter attacking
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If you throw in some equipment of counter proliferation, youll be doing damage to each opponent in no time
Play with Friends You can play against your friends on MTG Arena, the mode you need is Challenges