Gala Greeters

Alliance — Whenever another creature you control enters, choose one that hasn't been chosen this turn —
• Put a +1/+1 counter on this creature.
• Create a tapped Treasure token.
• You gain 2 life.

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Streets of New Capenna

Alliance — Whenever another creature enters the battlefield under your control, choose one that hasn't been chosen this turn —
• Put a +1/+1 counter on Gala Greeters.
• Create a tapped Treasure token.
• You gain 2 life.

If multiple creatures enter the battlefield simultaneously, you must still choose different modes for each instance of the triggered ability that's put onto the stack. If more than three creatures enter the battlefield simultaneously, that choice is made only for the first three.