You use the attack and flip two heads out of four, which deals 100 damage and loses you two fire energies, meaning you probably defeated an important mon and still have enough energy to knock out another mon next turn
As long as you have access to 5 mana, the mere threat of activation makes it very annoying for your opponent to get into combat with your creatures, especially when Dual-Sun Adepts also has double strike
Skylasher is a pretty obvious inclusion in this deck because it is the best Hexproof creature against Mono-Blue Devotion
The monarch draws a card at the beginning of their end step, and players who aren't the monarch can become the monarch by dealing combat damage to the current monarch or by playing their own monarch card
Sure, you need to play creatures that enter and gain counters (through themselves, or other means), but this team-up will do a lot of extra damage
1 Lightning Bolt