Duo, Despicable Polyglot

Flying, Deathtouch
Duo gets +4/+4 if an opponent has not used
Duolingo for more than fifteen minutes today.
Creatures that opponents control gain defender if
their controller has not used Duolingo for more
than fifteen minutes today.
Escape-{x}{u/b}, Exile X creatures. X is the number
of opponents that have Duolingo on a phone or
tablet with them.