As an additional cost to cast this spell, exile three or more creature cards with different names from your graveyard.
Whenever this creature attacks, defending player chooses a card exiled with it. Put that card onto the battlefield under your control.

{B}, Sacrifice Serrated Fossil: Choose a nonland card name. Target player reveals their hand and discards a card with that name if able. Activate only as a sorcery.
Surface {3}{B}{B}. Serrated Fossil surfaces transformed.

Whenever a nontoken creature you control dies, create a token that's a copy of it, except it's a Minion and has decayed.

At the beginning of your end step, put a +1/+1 counter on each tapped creature you control.
{G}{W}{U}, Remove five counters from among creatures you control, Sacrifice Severin's Masterwork: Create Chaneryx, Perfect Lifeform, a legendary 10/10 green, white, and blue Leviathan creature token with ward {10}.

You may remove +1/+1 counters from creatures you control as though they were loyalty counters on Severin, Sparkmind to pay its loyalty costs.
[0]: Create a 0/0 colorless Robot artifact creature token with two +1/+1 counters on it.
[–2]: You may tap or untap each of up to three target permanents.
[–7]: If it isn't an extra turn, take an extra turn after this one.

When Shadow Sky enters and whenever you cast a spell, each creature target player controls gets -1/-1 until end of turn.

Solidarity
You may look at the top card of your library any time.
You may cast creature spells that have a creature type no creature you control does from the top of your library.

Shell Cove enters tapped.
{T}: Add {G} or {U}.
{9}{G/U}: Shell Cove becomes a 7/7 green and blue Leviathan creature with ward {3} until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to green and blue. Activate only once each turn.

At the beginning of your end step, create a 1/1 blue Ninja creature token with “This creature can't be blocked by creatures with greater power.”
Whenever you activate a ninjutsu ability for the first time each turn, untap up to two target lands you control.

Time loop
I — Create a tapped Treasure token.
II — You may discard a card. If you do, exile the top two cards of your library. You may play one of those cards this turn.
III — This Saga deals 2 damage to each opponent.

Draw cards equal to the greatest power among creatures you control. At the beginning of the next end step, discard that many cards.

Flash
Whenever one or more counters are put on another creature you control, you may put a +1/+1 counter on Shiori.
{2}: Change a target of target spell to a creature or enchantment you control with one or more counters on it.

Shock deals 2 damage to any target.

{4}{B}: You draw a card and you lose 1 life. This ability costs {1} less to activate for each other Shrine you control. Activate only once each turn.

At the beginning of your upkeep, create a 1/1 white Human creature token for each Shrine you control.

Creatures you control get +1/+1 for each Shrine you control.

At the beginning of your upkeep, exile the top card of your library. You may play it this turn. If you control a number of Shrines greater than or equal to that card's mana value, you may cast it without paying its mana cost.

Untap up to X permanents you control during each other player's untap step, where X is the number of Shrines you control.

Shrine to Those Forgotten enters tapped.
{1}, {T}: Add X mana is any combination of colors, where X is the number of Shrines you control.

Flash
Whenever you cast Siflir, Elder Pawn or another spell, if you paid an alternate or additional cost to cast it, draw a card.
Wander {3}{U}{U}

Creatures your opponents control get -1/-0.
Whenever this creature attacks, defending player mills a number of cards equal to 0 minus its power.
At the beginning of your end step, gain control of target creature with power 0 or less.

Choose up to one for each color among green, white, and blue among permanents you control.
• Put two +1/+1 counters on target creature.
• Target player draws a card for each creature they control with a counter on it.
• Untap all nonland permanents target player controls.

Exile target nonland permanent with mana value less than or equal to the amount of life you've lost this turn.

Flying, trample, lifelink
Ward—Pay 7 life.

Vigilance
Whenever a creature token you control deals combat damage to a player, draw a card.