Perhaps it is because of the list.
The key is to kill your pia.
1. -3 Huatli killing your pia and making one of the opponent's creatures unable to block. They gain a life. 11/14.
2. Combat, trigger Gpgs targeting so that fireweaver comes back first, then serpent, then pia, then temmet.
3. Fireweaver comes back, triggers, drain for 2. 9/16
4. Serpents come back, triggers, 7/18
5. Pia comes back, legend rules, triggers. 5/21
6. Pia's buddies come out, 4 thopters, 4 drains, triggers. 1/25
7. Fireweaver triggers (technically 2 sets of triggers inbetween but doesn't matter) 1/17
8. Don't use the last Gpg, it will kill you.
9. Before attackers, sac 3 thopter tokens and all 4 Gpgs to make opponent's things unable to block with pia. Triggers. 1/20
10. Full swing, 5 4/4s for 20 damage.