1) Get Sisay out
2) Swarm
Sisay:
2W 2/2
+1/+1 for each color of legendary permanent you control
WUBRRG: play a legendary permanent from your deck with CMC less than Sisay's power
Selvala HOTW: 1GG, 2/3, when a creature ETB with the highest power, its controller draws a card; Tap G: add X mana of any color where X is the highest power of creatures you control
With these two, a power 6 creature, and 5 legendary colors, you can bring out all of the following, using each to untap selvala and loop.
Derevi: WUG, 2/3 flyer, whenever it ETB or a creature you control deals combat damage to a player, tap or untap target permanent. Drop when sisay is at power 4 to get to at least power 5 and untap selvala.
Minamo: Legendary land, taps for B, or tap B to untap a leg perm
Samut VOD: 3RG, 3/4 DS vig haste, all your creatures get haste, Tap W: untap another creature. Allows you to start playing tap-requiring creatures.
Gideon, Martial Paragon: 4W, +5 planeswalker, with +2: untap all creatures you control, they get +1/+1 till the end of the turn
