Greater Sandwurm
Creature — Wurm
This creature can't be blocked by creatures with power 2 or less.
Cycling 
(, Discard this card: Draw a card.)
A sandwurm can lie in wait beneath the sands for years until the slightest tremor alerts it to the presence of prey.
Steven Belledin
The List (PLST)
• #AKH-168Rulings
Once a creature with power 3 or greater has blocked Greater Sandwurm, changing the power of the blocking creature won’t cause Greater Sandwurm to become unblocked.
(wotc • 2020-04-17)
Rulings
Once a creature with power 3 or greater has blocked Greater Sandwurm, changing the power of the blocking creature won’t cause Greater Sandwurm to become unblocked.
(wotc • 2020-04-17)