msem-instigator

Flash
Enchant creature
Enchanted creature gets +1/+1 and has hexproof.

You may cast this spell as though it had flash if it targets a creature or planeswalker.
Burning Up deals X damage to any target, where X is the number of basic land types among lands you control.

Converge — Destroy up to X target artifacts or enchantments, where X is the number of colors of mana spent to cast Bury the Past.

Menace, haste
Cadence (Whenever you cast a spell, if its mana value is greater than this creature's power, put a +1/+1 counter on this creature.)

Flying
When Calamity Dragon enters the battlefield, it deals 2 damage to each creature you don't control. Whenever a creature dealt damage this way dies this turn, Calamity Dragon deals 2 damage to that creature's controller.

Call of the Abyss deals 3 damage to any target and you gain 3 life.

Target player mills three cards for each artifact you control.

{1}{G}{G}, Sacrifice a creature: Search your library for a creature card with mana value X or less, where X is 1 plus the sacrificed creature's mana value. Put that card onto the battlefield, then shuffle. Activate only as a sorcery.

Creatures you control have haste and attack each combat if able.
Attacking Soldiers you control get +1/+0.

Careless Violence deals 2 damage to each creature. If a creature dealt damage this way would die this turn, exile it instead.

Whenever you cast a noncreature spell, if you control exactly one creature, copy that spell. You may choose new targets for the copies. (If it's a permanent, it resolves as a token.)

When Channeler of the Veil enters the battlefield, create a 1/1 colorless Construct artifact creature token.
Sacrifice another creature: Each opponent loses 1 life.

Search your library for three differently named noncreature, nonland cards with mana value 3 or less not named Chaos Is Your Redemption and exile them, then shuffle. If you exile three cards this way, cast one at random without paying its mana cost. Then shuffle the rest into your library.

Reveal the top seven cards of your library. Starting with you, each player chooses a nonland card from among them that hasn't been chosen this way. Put the chosen cards into your hand and the rest on the bottom of your library in a random order.

For each player, that player may search their library for a basic land card, choose a land card from their hand, and choose a land card from their graveyard, then put those cards onto the battlefield tapped. Then each player that searched their library this way shuffles it.

Other Warriors you control have trample.
{G}: Chratteri Valiant gets +2/+2 and gains trample until end of turn. Activate only once each turn.

Flying
Lands you control have “{T}: Add one mana of any color.”
As long as you control seven or more lands, creatures you control have trample, haste, and hexproof.

Search target opponent's library for six cards and exile them, then that player shuffles. Skip your next turn.

{T}: Add {C}.
{3}, {T}, Sacrifice City Gate: Put two +1/+1 counters on target creature you control that attacked this turn.

When Citywide Automation enters the battlefield, create two 1/1 colorless Construct artifact creature tokens.
{2}{W}{W}, Sacrifice Citywide Automation: Creatures you control get +1/+1 until end of turn. Activate only as a sorcery.

Search your library for a basic land card and put that card onto the battlefield, then shuffle.
{5}{G}{W}, Exile Claim for Civilization from your graveyard: Create a 6/6 colorless Golem artifact creature token. Activate only as a sorcery.

This spell costs {3} less to cast if it targets a permanent with mana value 3 or less.
Gain control of target nonland permanent until end of turn. Untap it. It gains haste until end of turn.

Whenever you cast an instant or sorcery spell, you may exile that card instead of putting it anywhere else as it resolves.
At the beginning of your upkeep, Clash Reactor deals X damage to each opponent, where X is the number of colors of cards exiled with Clash Reactor.

Haste
Coldhearted Explorer can't block.

Haste
When Collapsing Star Viper enters the battlefield, you may tap target permanent with mana value X or less.
At the beginning of your upkeep, return Collapsing Star Viper to its owner's hand.