Kumena, Tyrant of Orazca

Tap another untapped Merfolk you control: Kumena, Tyrant of Orazca can't be blocked this turn.
Tap three untapped Merfolk you control: Draw a card.
Tap five untapped Merfolk you control: Put a +1/+1 counter on each Merfolk you control.

Secret Lair Drop

The Lost Caverns of Ixalan Commander

Rivals of Ixalan Promos

Rivals of Ixalan

Activating Kumena's first ability after it has become blocked won't cause it to become unblocked.

To activate Kumena's abilities, you may tap any untapped Merfolk you control, including one you haven't controlled continuously since the beginning of your most recent turn. (Note that tapping the creature doesn't use {T} [the tap symbol].) For Kumena's second and third abilities, this includes Kumena itself.