Greater Sandwurm
Creature — Wurm
This creature can't be blocked by creatures with power 2 or less.
Cycling 
(, Discard this card: Draw a card.)
Steven Belledin
Amonkhet Remastered (AKR)
• #192Rulings
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)