When Acererak enters, if you haven't completed Tomb of Annihilation, return Acererak to its owner's hand and venture into the dungeon.
Whenever Acererak attacks, for each opponent, you create a 2/2 black Zombie creature token unless that player sacrifices a creature of their choice.

Whenever a Warrior attacks, you may have its controller create a 1/1 white Warrior creature token that's tapped and attacking.
: Untap all attacking creatures. They gain trample, lifelink, and haste until end of turn. After this phase, there is an additional combat phase. Activate only during combat.

Whenever you cast your first instant or sorcery spell each turn, exile an instant or sorcery card at random from your graveyard. Then copy each card exiled with this enchantment. You may cast any number of the copies without paying their mana costs.

Jagged-Scar Archers's power and toughness are each equal to the number of Elves you control.
: This creature deals damage equal to its power to target creature with flying.

Allons-y! — Whenever you attack, exile cards from the top of your library until you exile a nonland card. Put three time counters on it. If it doesn't have suspend, it gains suspend.
Timey-Wimey — : Time travel three times. Activate only as a sorcery. (For each suspended card you own and each permanent you control with a time counter on it, you may add or remove a time counter. Then do it two more times.)

This creature has haste as long as you control a red creature.
This creature has wither as long as you control a green creature. (It deals damage to creatures in the form of -1/-1 counters.)

At the beginning of each player's draw step, that player draws an additional card.

: Add .
: Each player gains control of all creatures they own.

: You may put a Faerie permanent card from your hand onto the battlefield.
: Target green creature gains protection from black until end of turn.

+1: Untap two target lands.
−1: Create a 3/3 green Beast creature token.
−4: Creatures you control get +3/+3 and gain trample until end of turn.

Reach
Whenever another permanent you control enters, if it wasn't put onto the battlefield with this ability, you may put a permanent card with equal or lesser mana value from your hand onto the battlefield.
Partner (You can have two commanders if both have partner.)

When this creature enters, destroy target land.

(: Add .)

, : You gain 5 life. Shuffle this artifact and your graveyard into their owner's library.

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Flying
Ward—Sacrifice a creature.
Whenever a creature dies, target opponent loses 2 life and you gain 2 life.

: Add .
: Add or . This artifact deals 1 damage to you.

, : Untap target artifact.

Tap an untapped Merfolk you control: Target player mills a card.

Whenever you sacrifice this artifact or another artifact, you may pay . If you do, at the beginning of the next end step, create a token that's a copy of that artifact.
, Sacrifice this artifact: Draw a card.