If you would gain life, you gain twice that much life instead.
If you would draw a card except the first one you draw in each of your draw steps, draw two cards instead.

When Alharu enters, put a +1/+1 counter on each of up to two other target creatures.
Whenever a nontoken creature you control with a +1/+1 counter on it dies, create a 1/1 white Spirit creature token with flying.
Partner

: Tap target Wall.

Damage that would reduce your life total to less than 1 reduces it to 1 instead.

Target blocking creature gets +3/+1 until end of turn.

Other artifact creatures you control have haste.
Whenever one or more artifact creatures you control attack, Alibou deals X damage to any target and you scry X, where X is the number of tapped artifacts you control.

At the beginning of combat on your turn, if you've cast a noncreature spell this turn, create a Treasure token.
Sense the Good — At the beginning of your end step, each player gains control of all creatures they own.

Haste
This token attacks each combat if able.

First strike, vigilance
Whenever an opponent casts a creature spell, this permanent isn't a creature until end of turn.

At the beginning of combat on your turn, create a 1/1 red Alien creature token with haste and "This token attacks each combat if able." Put a +1/+1 counter on it for each invasion counter on this enchantment, then put an invasion counter on this enchantment.

Enchant creature
Enchanted creature gets +1/+1, has menace, and is a Symbiote in addition to its other types.
You may cast this card from your graveyard by discarding a card in addition to paying its other costs.

Spells can't be countered.
As long as it's your turn, each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost.

Flurry — Whenever you cast your second spell each turn, put a rally counter on this enchantment. Then create a 1/1 white Monk creature token with prowess for each rally counter on it.

When this artifact enters, exile all creatures with power 5 or greater until this artifact leaves the battlefield. (Those creatures return under their owners' control.)

Alirios enters tapped.
Alirios doesn't untap during your untap step if you control a Reflection.
When Alirios enters, create a 3/2 blue Reflection creature token.

Partner with Alphinaud Leveilleur
First strike
Dualcast — The second spell you cast each turn costs less to cast.

Whenever you cast a historic spell, create a 1/1 white Soldier creature token. (Artifacts, legendaries, and Sagas are historic.)
Whenever Alistair attacks, you may pay . If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control.

Create a 3/3 green Centaur creature token.
Fuse

You gain 2 life for each creature you control.
Fuse

Exile target non-Pilot creature you control, then return that card to the battlefield under its owner's control.

Exile All Hallow's Eve with two scream counters on it.
At the beginning of your upkeep, if this card is exiled with a scream counter on it, remove a scream counter from it. If there are no more scream counters on it, put it into your graveyard and each player returns all creature cards from their graveyard to the battlefield.

When you set this scheme in motion, take an extra turn after this one. Schemes can't be set in motion that turn.

Each player sacrifices all permanents they control that are one or more colors.

Time travel.
Storm