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Here's an example: The Priest of Titania always taps for because it counts itself, but the reason this card is considered a threshold card (because remember we require an external criteria in the definition) is because its strength comes from counting other Elves on the battlefield

Creature - Beast Cat Color tag templates(None) Feline Sovereign Other Cats you control get +1/+1 and have protection from Dogs

You gain life equal to that creatures toughness

Since then weve also seen Destiny HEROs, Masked HEROs, Evil HEROs, Vision HEROs, and Xtra HEROs all of which have made the HERO card pool very diverse and powerful