I Bask in Your Silent Awe

(An ongoing scheme remains face up until it's abandoned.)
Each opponent can't cast more than one spell each turn.
At the beginning of your upkeep, if no opponent cast a spell since your last turn ended, abandon this scheme.

Look Skyward and Despair

When you set this scheme in motion, create a 5/5 red Dragon creature token with flying.

Know Naught but Fire

When you set this scheme in motion, it deals damage to each opponent equal to the number of cards in that player's hand.

Choose Your Demise

When you set this scheme in motion, look at the top four cards of your library and separate them into a face-down pile and a face-up pile. An opponent chooses one of those piles. Put the cards in that pile into your hand and the rest on the bottom of your library in any order.

Approach My Molten Realm

When you set this scheme in motion, until your next turn, if a source would deal damage, it deals double that damage instead.

My Crushing Masterstroke

When you set this scheme in motion, gain control of all nonland permanents your opponents control until end of turn. Untap those permanents. They gain haste until end of turn. Each of them attacks its owner this turn if able.

Realms Befitting My Majesty

When you set this scheme in motion, search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Which of You Burns Brightest?

When you set this scheme in motion, you may pay {X}. If you do, this scheme deals X damage to target opponent or planeswalker and each creature that player or that planeswalker's controller controls.

All Shall Smolder in My Wake

When you set this scheme in motion, destroy up to one target artifact, up to one target enchantment, and up to one target nonbasic land.

My Wish Is Your Command

When you set this scheme in motion, each opponent reveals their hand. You may choose a noncreature, nonland card revealed this way and cast it without paying its mana cost.

Choose Your Champion

When you set this scheme in motion, target opponent chooses a player. Until your next turn, only you and the chosen player can cast spells and attack with creatures.