msem-instigator

Reveal the bottom four cards of your library. Choose up to one permanent card with mana value 3 or less from among them and put it onto the battlefield. Put the rest on the bottom of your library in any order.

Sycophantic Aristocrat gets +2/+1 as long as you control another Noble.

When Razorshell Marauder enters the battlefield, you may sacrifice a land or exile a land card from your graveyard. When you do, target creature gets -1/-1 until end of turn and can't block this turn.

Flash

Whenever a creature dealt damage by Mooncursed Howler this turn dies, create a 2/2 red Werewolf creature token with first strike.

{1}, {T}: Surveil 2.
{U}, {T}, Discard a card: Look at the top card of your library. If it's a nonland card, you may cast it. (You still pay its costs)

Menace
Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)

Choose two —
• Target player creates two 1/1 white Soldier creature tokens.
• Exile target attacking creature.
• Creatures target player controls gain indestructible until end of turn.
• Put a +1/+1 counter on target creature and untap it.

Each player chooses three permanents they control, then returns the others to their owners' hands. Each player loses all unspent mana.
Exile Turn the Record Over.

Enchant opponent
When Pathless Shallows enters the battlefield, exile target creature enchanted player controls until Pathless Shallows leaves the battlefield.
Enchanted player can't cast spells with the same name as the exiled card.

Destroy target creature. Its controller loses 1 life.

{T}: Add {R} or {W}. You lose 1 life unless you have less life than an opponent.

Search target opponent's library for a card with mana value 3 or less and exile it with a smoke counter on it. Then that player shuffles. You may play that card for as long as it remains exiled, and you may spend mana as if it were any color to cast it.

This spell costs {1} less to cast for each Zombie creature card in your graveyard.
When Undead Harbinger enters the battlefield, return target Zombie card from your graveyard to your hand.

Create a 2/2 red and white Cat Knight creature token. Creatures you control get +1/+1 and gain haste until end of turn.

When Field Technician enters the battlefield, you may search your library for an artifact card, reveal it, then shuffle and put that card on top of it.
Artifact creatures you control get +1/+1.

When Killdrone Engineer enters the battlefield, create a 1/1 colorless Servo artifact creature token.
Artifacts you control have deathtouch.

Whenever another creature or enchantment enters the battlefield under your control, you gain 1 life.
{3}{W}{W}, Pay 5 life: Castigated Sister becomes a 5/5 Angel Horror with flying. (This effect doesn't end at end of turn.)

Enchant creature
Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Enchanted creature doesn't untap during its controller's untap step.

Haste
Whenever two or more creatures you control deal combat damage to a player, tap those creatures, then gain control of target creature you don't control until end of turn. Untap that creature. It gains haste until end of turn. After this phase, there's an additional combat phase.

Haste
Whenever Spotted Slugger deals combat damage to a player, you may have it deal damage equal to its power to target creature.

Choose one —
• Target opponent discards a card.
• Amosis Charm deals 1 damage to any target and you gain 1 life.

When Keepsake of Binding enters the battlefield, exile target creature an opponent controls until Keepsake of Binding leaves the battlefield.
{4}, {T}: Tap target creature with power less than the exiled card's power.

Heroic — Whenever you cast a spell that targets Satyr Vigormage, choose one —
• Put a +1/+1 counter on Satyr Vigormage.
• Satyr Vigormage fights target creature you don't control.
• Search your library for a land card, reveal it, put it into your hand, then shuffle.

Cresting Bay enters the battlefield tapped unless you control a basic Island.
{T}: Add {U}.
{2}{U}{U}: Until end of turn, Cresting Bay becomes a 3/3 blue Elemental creature with “Whenever this creature attacks, you may draw a card then discard a card.” It's still a land.