Katara, Water Tribe's Hope
Legendary Creature — Human Warrior Ally
3 / 3
Vigilance
When Katara enters, create a 1/1 white Ally creature token.
Waterbend

: Creatures you control have base power and toughness X/X until end of turn. X can't be 0. Activate only during your turn. (While paying a waterbend cost, you can tap your artifacts and creatures to help. Each one pays for

.)
Katara, Water Tribe's Hope's ability overwrites any effects that previously set a creature's base power and/or toughness. Any existing effects or counters that raise or lower a creature's power and/or toughness continue to apply.