I conquer with plundering poro and play a treasure. Does this satisfy the condition for Legion and can I play a Noxus Hopeful for 2 energy?

Whether you can play Noxus Hopeful for [2] Energy depends entirely on whether the "Treasure" you played was a card or a token.

The Ruling

• If you played a Treasure Card: Yes, you satisfied the Legion condition. Playing a card from your hand (or other zone) is the game action of playing a card, which satisfies the requirement for Legion to become active.
• If you played a Treasure Token: No, this does not satisfy the Legion condition. While tokens can be "played" (Rule 349.2), Rule 812.1.c specifically requires "a card different than the one with the Legion ability" to have been finalized. Tokens are not cards (Rule 182).

Explanation of the Sequence

1. Conquer with Plundering Poro: This triggers the Poro's ability: "When I conquer, play a Gold gear token exhausted." This token is placed on the chain and finalized. Because it is a token, it does not count as "playing a card" for the purposes of the Legion keyword.
2. Playing the Treasure:
   • If the Treasure is a card (e.g., from your hand), playing it finalizes an item that is a card, which satisfies the Legion condition for your Noxus Hopeful.
   • If the Treasure is a token (e.g., created by another ability), it does not satisfy the condition.
3. Finalization: As long as the card (the Treasure) has finished being finalized on the chain, the dependent Legion ability on Noxus Hopeful becomes active.
4. Cost: Once active, the Legion ability reduces the cost of Noxus Hopeful by [2]. Its base cost of [4] becomes [2].

Summary: Only cards satisfy the Legion keyword. Tokens do not. Ensure your "Treasure" is an actual card from your deck to get the cost reduction.