Beast of the mountains

Flash, Haste
When this creature enters the battlefield, you may pay X. If you did, this
creature gets X +1/+1 counters until the end of
this turn.
If X was 6 or more, create an emblem with: 'cast
other creature spells as if they had flash and haste
as long as Beast of the Mountains is on the battlefield'.
Unearth, {3}