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Shadowmoor was the first set to have hybrid cards with hybrid activations
Herald of Eternal Dawn Rarity: Mythic Rare TYPE: Creature SUBTYPE: Angel CMC: 7 Mana cost: USD: $4.01 EUR: 4.49 TIX: 0.03 EDHREC RANK: 4372 (6/6) Flash (You may cast this spell any time you could cast an instant.) Flying You can't lose the game and your opponents can't win the game
However, its currently pushing $15, and if thats too high for the ethos of the decks, I could see this doubling
This enchantment triggers on non-creature spells with a punishing four-mana tax that opponents rarely pay during the opening turns, generating multiple cards before its cumulative upkeep becomes prohibitive
While she wont always double treasure production, many cards like Parallel Lives that are known for doubling creature tokens will also double treasure tokens, so a lot of popular token support is still open when deckbuilding