Reservoir Kraken

Trample, ward {2}
At the beginning of each combat, if Reservoir Kraken is untapped, any opponent may tap an untapped creature they control. If they do, tap Reservoir Kraken and create a 1/1 blue Fish creature token with "This creature can't be blocked."

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Each opponent in turn order may choose to tap an untapped creature as Reservoir Kraken's triggered ability resolves, even if a player earlier in the turn order already chose to tap a creature. Reservoir Kraken's controller will create a maximum of one Fish creature token each combat, no matter how many creatures were tapped.

Players won't know which player or planeswalker Reservoir Kraken will attack, if any, when deciding whether to tap an untapped creature for its triggered ability.