Giving your opponent a poison counter is a nice bit of upside, but three mana for an effect like this puts it behind the curve
Cackling Fiend Most discard in multiplayer is weak because it only hits one player, often makes an enemy of that player, and usually doesnt scale in power to reflect the neediness of card advantage in a format where you are being outdrawn one-to-X, where X is the number of opponents you have
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It's seen some success outside of that
Card Text: Menace, haste Whenever Satya, Aetherflux Genius attacks, create a tapped and attacking token that's a copy of up to one other target nontoken creature you control
Match Battle is reportedly intended to bridge young folks and new players into the full rules of the Pokmon TCG