msem-instigator

Create three 1/1 colorless Construct Actor creature tokens.

This spell can't be countered.
Flying
When Aunor, Dragonsire or another Dragon enters the battlefield under your control, untap target land. That land becomes a 5/5 Dragon creature with flying and haste in addition to its other types.

Trample
Auspicious Qilin must be blocked if able.

Distribute four +1/+1 counters among up to two target lands you control. Those lands become 0/0 Elemental creatures with haste until end of turn. If you're attacking, tap those lands. They're attacking.
Showcase {3}{R}{G} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

When Autumnal Resonants enters the battlefield, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Create a 3/3 red and green Elemental creature token with haste.

This spell can't be countered.
Survivor spells you cast can't be countered.
Whenever a nontoken Survivor enters the battlefield under your control, create a tapped 1/1 Survivor creature token that's all colors.

The first instant or sorcery spell you cast each turn has convoke. (Each creature you tap while casting that spell pays for {1} or one mana of that creature's color.)

Flying, trample
Prismatic — Whenever you cast a multicolored spell, put a +1/+1 counter on Azure Caterwauler.

Enchant player
At the beginning of each end step, create X 1/1 green Snake creature tokens, where X is the amount of life enchanted player lost this turn.

At the beginning of combat on your turn, target creature you control has base power and toughness 5/5 until end of turn.

Creature spells you cast cost {1} less to cast.
Whenever you cast a creature spell, Bellowing Thoctar gets +2/+2 until end of turn.

[+2]: Create a 3/3 red Wurm creature token.
[–2]: Up to three target creatures each get +2/+2 until end of turn. Bessie deals 2 damage to each of up to three target creatures.
[–9]: You get an emblem with “Creatures you control have base power and toughness 7/7 and have indestructible.”

Trample, haste, indestructible
Whenever a permanent an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on target Ooze.

Trample, haste
When Blazing Fox enters the battlefield, you may tap an untapped creature you control. If you do, Blazing Fox gets +X/+0 until end of turn, where X is that creature's power.

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
This permanent gets +2/+2 for each card and token merged with it.

Vigilance, trample
When Border Guardian enters the battlefield, return a creature you control to its owner's hand.

Other creatures you control have haste.
Whenever Breach Titan enters the battlefield or attacks, abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)
At the beginning of your end step, return another target creature you control to its owner's hand.

You may put a permanent card from your hand onto the battlefield. If it's a planeswalker, it enters the battlefield with five loyalty counters rather than any other amount, and you may activate its loyalty abilities this turn any time you could cast an instant.

Rouse 2. Target permanent gains trample until end of turn if it's a creature. (Distribute two +1/+1 counters among permanents you control. If they aren't creatures, tap them and they become 0/0 creatures in addition to their other types.)

If you would draw a card, you may instead choose creature or land and exile cards from the top of your library until you exile a card of the chosen type. Put that card into your hand and put all other cards exiled this way on the bottom of your library in a random order.

Augmented — Whenever Bril, the Oltenen Emissary enters the battlefield or attacks, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, destroy target permanent.

Double strike
Whenever you cast a noncreature spell, you may choose one that hasn't been chosen —
• Tap or untap target permanent.
• Draw two cards, then discard a card.
• Creatures you control get +1/+1 until end of turn.

Brutal Struggle deals 2 damage to any target. Put a +1/+1 counter on up to one target creature.

Whenever another creature enters the battlefield, Brutish Champion fights that creature.

Flying
Whenever a permanent you control becomes the target of a spell or ability you don't control, choose one —
• Create a 3/3 red Manticore creature token.
• Create two Treasure tokens.
• Draw a card.