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Semester's End is an especially powerful flicker card in this deck because it gives you lots of triggers from Reaper King and also buffs all your creatures

Shelga, the Tri-Warlord WATER/Psychic Level 7 Pendulum/Normal Scale 10 2800/2500 Pendulum Effect: Once per turn: You can banish 3 Psychic-Type Pendulum Monsters you control, then target 1 Pendulum Monster you control

This is an insanely flexible way of setting up your ritual plays

There are two rules in particular that trip a lot of people up: Engagement and Hunting

This will deal with cards like Bottomless Trap Hole that would otherwise get in the way of you summoning your more powerful Monarchs, and as such is a fantastic inclusion for any monarch deck