Tahm Kench, River King

Deathtouch
All black and green creatures get +0/+2
{2} During combat before damage, an opponent
may activate this ability by paying its cost. Tahm Kench, River King loses all abilities, but gains indestructible. Replace target blocking creature
with Tahm Kench, River King until end of turn.
Tahm Kench, River King's controller may pay {1}
to counter this effect.