You may discard an Island card and another card rather than pay this spell's mana cost.
Counter target spell.

Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.)
At the beginning of the end step, sacrifice this enchantment.

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
This land enters tapped.
: Add .
, : You may play the exiled card without paying its mana cost if an opponent was dealt 7 or more damage this turn.

, : Counter target instant or Aura spell that targets a permanent you control.

This spell costs less to cast for each card type among cards in your graveyard.
When you cast this spell, you gain control of target opponent during that player's next turn. After that turn, that player takes an extra turn.
Flying, trample, protection from instants

When this creature enters, look at the top X cards of your library, where X is your devotion to blue. Put up to one of them on top of your library and the rest on the bottom of your library in a random order. If X is greater than or equal to the number of cards in your library, you win the game. (Each in the mana costs of permanents you control counts toward your devotion to blue.)

Search your library for a card, put that card into your hand, then shuffle. You lose 3 life.

As an additional cost to cast this spell, sacrifice a green creature.
Search your library for a green creature card, put it onto the battlefield, then shuffle.

Indestructible
As long as your devotion to red is less than five, Purphoros isn't a creature.
Whenever another creature you control enters, Purphoros deals 2 damage to each opponent.
: Creatures you control get +1/+0 until end of turn.

Flying, vigilance, deathtouch, lifelink
At the beginning of your end step, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Creatures you control get +1/+1.

Flying, trample
Ward—Discard a card.
Creatures your opponents control have base toughness 1.

Counter target spell.
Draw a card.

At the beginning of your upkeep, you may have target opponent discard a card at random.
Whenever an opponent discards a card, you may create a 1/1 green Elf Warrior creature token.

At the beginning of your upkeep, if an opponent controls more lands than you, you may search your library for up to three basic land cards, reveal them, put them into your hand, then shuffle.

Equipped creature gets +1/+1 and has ", Exile The Dominion Bracelet: You control target opponent during their next turn. This ability costs less to activate, where X is this creature's power. Activate only as a sorcery." (You see all cards that player could see and make all decisions for them.)
Equip

When this creature enters, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle.
, : You may put an Equipment card from your hand onto the battlefield.

Sacrifice any number of permanents. You gain 2 life for each permanent sacrificed this way.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I, II, III — Create a 3/3 black Wraith creature token with menace. The Ring tempts you.
IV — For each opponent, gain control of up to one target creature that player controls until end of turn. Untap those creatures. They gain haste until end of turn. The Ring tempts you.

Draw two cards, then discard two cards.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)