I didn't know if Lessons would work, but I felt they were worth testing
In fact, the right side of the dungeon (Scry 2, Make a Treasure, and then make a 4/1 with menace) can help you rebuild after one of the creatures dies and gets you back on board, not to mention the fact that you could also just cast another Intiative creature and progress the dungeon that way
Once Namor's last ability triggers, it doesn't matter what happens to any player's life total in response
It also removes a Voltron or combo creature across the table for a rotation, and it can remove an entire board of blockers, granting you a free attack
Then, when you attack you can hopefully render their defenses useless by making their non-flying creatures unable to block