Tervigon, of the Swarm

At the beginning of your upkeep if
Tervigon, of the Swarm is in your command
zone create a 1/1 black termagant token with
Swarm 1.
Swarm 5 — at the beginning of your combat
phase if you control a total swarm of 5 or more,
swarm creatures you control get +1/+0 and
"whenever this creature deals combat damage to
a player, it deals that much damage plus one.