Dreyar, Cloud Regent

Flying, shroud

Dreyar, Cloud Regent's toughness is equal to the number of non-basic lands its owner controls. (If you don't control any, this spell can't
be cast.)
{7}{g/u}{g/u}, {t}: All lands become 5/X Cloud creatures with flying until your next turn, where X is the number of non-basic lands its owner controls. (If you don't control any, X is 0.)