Unexplained Levitation

Cumulative upkeep {1} (At the beginning of your
upkeep, put an age counter on this permanent, then
sacrifice it unless you pay its upkeep cost for each age
counter on it.
All creatures gain flying and cannot attack
or block.
"We was jus' floatin', was'n we Bill? Wit' now'ere
tah go. Wierd, that time."