mtg.wtf

[+1]: Create a 2/3 blue and black Nightmare creature token with "Whenever this creature attacks or blocks, each opponent exiles the top two cards of their library."
[–3]: Return target nonland permanent to its owner's hand, then that player exiles a card from their hand.
[–7]: You may cast up to three spells from among face-up cards your opponents own from exile without paying their mana costs.

At the beginning of your end step, you may sacrifice an artifact, creature, enchantment, land, or planeswalker. If you do, each opponent may sacrifice a permanent that shares a card type with it. For each opponent who doesn't, that player loses 2 life and you draw a card.

Convoke
Target creature gets -3/-3 until end of turn.

I — Destroy target creature an opponent controls with power 2 or less.
II — Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.
III — Exile target opponent's graveyard.

When Hopeless Nightmare enters the battlefield, each opponent discards a card and loses 2 life.
When Hopeless Nightmare is put into a graveyard from the battlefield, scry 2.
{2}{B}: Sacrifice Hopeless Nightmare.

Menace
When Hunted Nightmare enters the battlefield, target opponent puts a deathtouch counter on a creature they control.

Flying
Nightmare's power and toughness are each equal to the number of Swamps you control.

Search target player's library for up to X cards, where X is the number of Swamps you control, and exile them. Then that player shuffles.

Equipped creature gets +1/+1 for each Swamp you control.
Equip—Pay 3 life.

Target player reveals their hand. You choose a card from it. That player discards that card.
Dredge 2

You gain 1 life. Target creature gets -X/-X until end of turn, where X is the amount of life you gained this turn.

Skulk
When Persistent Nightmare deals combat damage to a player, return it to its owner's hand.

Sacrifice a creature, Return Recurring Nightmare to its owner's hand: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

{T}, Sacrifice another creature or an artifact: For each opponent, you mill a card, then return that card from your graveyard to your hand unless that player pays 3 life.
Choose a Background

Soulbond
As long as Thundering Mightmare is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature."

Haste
When Thundermare enters the battlefield, tap all other creatures.

Target player discards two cards.