If you have more life than your starting life total, this spell costs {X} less to cast, where X is equal to the difference.
Trample
When Glacier Guardian enters the battlefield, you may have it fight target creature you don't control.

Return up to three target creature cards from graveyards to the battlefield under your control.
Flashback—{2}{B}{B}, Sacrifice three creatures.

This spell costs {1} less to cast for each card in exile you don't own.
Trample
When Proto-Class Behemoth enters, exile up to one target creature.

Exile all artifacts, creatures, and enchantments. Each player's life total becomes equal to their starting life total.

When All the Stars are Mine enters the battlefield and at the beginning of your upkeep, untap all noncreature permanents you don't control. You gain control of them until end of turn.

{4}{B}{B}, Exile Begin the Imperial Era from your hand: At the beginning of your next upkeep, you may cast Begin the Imperial Era from exile without paying its mana cost. Activate only as a sorcery.
You draw three cards and each opponent discards three cards. Each player loses 3 life.

This spell costs {1} less to cast for each kind of counter among permanents you control.
Reach, trample

This spell costs {1} less to cast for each instant and/or sorcery card in your graveyard.
When Heretic Hunters enters the battlefield, you may discard your hand. If you do, draw a card and Heretic Hunters deals 2 damage to each opponent.

Favored
Whenever your Champion attacks, creatures you control get +2/+2 until end of turn.

Flash
This spell costs {1} less to cast for each permanent with flash you control and each instant card in your graveyard.
Ward {2}

When Vorpal Titan enters the battlefield, destroy all nonbasic lands.

This spell can't be countered.
Haste
Whenever an opponent casts a spell during your turn or spends at least five mana to cast a spell, Aspirant's Bane deals 5 damage to that player.

When Blasphemous Bonecaller enters the battlefield or dies, you draw a card and you lose 1 life.
{1}{B}, Discard Blasphemous Bonecaller: You draw a card and you lose 1 life.

Take an extra turn after this one. Put Captivating Dreams on the bottom of your library.
If Captivating Dreams would be put into a graveyard from anywhere, exile it instead.

Choose a color. Exile all permanents of the chosen color. Until the end of your next turn, if you would add {C}, instead add {C} and one mana of the chosen color.

Colossal Tarasque can't be blocked by creatures with power 2 or less.
{2}, Discard Colossal Tarasque: Search your library for a basic Forest card, reveal it, put it into your hand, then shuffle.

This spell costs {X} less to cast, where X is your greatest devotion to a single color.
Menace

Flash
When Conduit of Change enters the battlefield, if you cast it, return all other nonland permanents to their owner's hands.
Spellcharge 7

Hexproof
When Dakran Shipcrusher enters the battlefield, you may bless target creature.

Exile all creatures and all cards from each player's hand. Any player may play those cards during their turn for as long as they remain exiled, and mana of any type can be spent to cast those spells.
Exile Dawn of Peace.

Enchant creature
Enchanted creature gets -4/-0 and loses flying.

Gain control of target creature.
{1}{U}, Discard Dominate Mind: Tap target creature. It doesn't untap during its controller's next untap step.

Create two tokens that are copies of target creature. Put a ward {2} counter on one of those tokens and a flying counter on the other.

Elephant of the Golden Palace enters the battlefield with your choice of a lifelink counter or an indestructible counter on it if {W} was spent to cast it. The same is true for flying or hexproof and {U}, deathtouch or menace and {B}, haste or double strike and {R}, and vigilance or trample and {G}.

Look at the top seven cards of your library. You may put an artifact card, a creature card, an enchantment card, a land card, and/or a planeswalker card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.