Heimdal, the Gatekeeper

Soldiers you control have +2/+1 and Haste
At the beginning of your upkeep, create a
1/1 White and Red, Asgard Soldier creature
token. Then if you control 5 or more soldiers,
transform Heimdal, the Gatekeeper.
If Heimdal, the Gatekeeper dies, exile it instead,
then return it to the battlefield during your next
upkeep.