Avatar: The Last Airbender (TLA)

Waterbend

The rule

While paying a waterbend cost, you can tap your artifacts and creatures: each one pays for one mana.

In play

Your creatures and artifacts act as mana: with many permanents these cards cost little; but tapping them this way keeps them from attacking.

The other mechanics of the set

The Waterbend cards, ranked

Ranked by win rate when the card is in hand (the cards with few games follow, by pick rating).