Luqwal, the White Wind

Flying
Bastion
(When Luqwal, the White Wind enters the battlefield, you may exile any number of
non-Titan creatures you control until Luqwal
leaves the battlefield. Then tap up to X target creatures, where X is the number of cards exiled
this way.)
Other creatures with power X or less don't untap during their controllers' untap steps., where X is
the number of cards exiled by Luqwal.