Search your library for a basic land card, put it onto the battlefield, then shuffle.
Acclimate.

When this creature enters, cache the top card of your library face down.

Choose one. If this spell's flashback cost was paid, instead choose three and you may choose the same mode more than once.
• Target player sacrifices a creature and a planeswalker.
• Target player discards two cards, then exiles their graveyard.
• All creatures get -2/-2 until end of turn.
Flashback {7}{B}{B}

Flying
Discard a card: Put a +1/+1 counter on Jetstream Cruiser. Activate only once each turn.

Choose any number —
• Each player sacrifices an enchantment.
• Each player sacrifices an artifact.
• Each player sacrifices a creature.

Deathtouch
Whenever Survivor of Pidae becomes the target of a spell you control, you may destroy target artifact or enchantment you don't control.

Vigilance
Whenever another creature you control dies, return to your hand target enchantment card from your graveyard with lesser mana value.

Enchant creature
Whenever enchanted creature attacks, put a +1/+1 counter on it. Then if it has three or more +1/+1 counters on it, sacrifice Ordeal of Athreos.
When you sacrifice Ordeal of Athreos, return target creature card from your graveyard to the battlefield.

At the beginning of your upkeep, if you have 50 or more life, you win the game.
At the beginning of each end step, you gain life equal to twice the amount of life you’ve lost this turn.

Target artifact or creature's owner puts it on the top or bottom of their library.
Flashback {5}{U}{U}

{U}: Psychohopper gains flying until end of turn.
{2}{G}: Psychohopper gets +2/+2 until end of turn. Activate only once each turn.

{T}: Add one mana of any color.
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, untap Speaker of Endless Winter and put a +1/+1 counter on it.

Exile up to two target artifacts, creatures, or lands you control, then return them to the battlefield under their owner's control. If any of those permanents are Ruins, they become creatures in addition to their other types until end of turn.

I — Draw two cards.
II — Return all nonland, nonenchantment permanents to their owners' hands.
III — You may cast a non-Saga spell with mana value 5 or less from your hand without paying its mana cost.

Cast this spell only during your turn.
Target creature gets +2/+0 and gains haste until end of turn. If it's attacking, instead it gets +2/+0 and gains trample until end of turn.
Flashback {1}{R}

{1}{W}, {T}: Tap target creature.
Spellcharge 3

Choose one —
• Each opponent sacrifices a creature that's one or fewer colors.
• Each opponent sacrifices a creature that's two or more colors.

Enchant creature with another Aura attached to it
Enchanted creature gets +3/+3 and has trample, vigilance, and reach.

This land enters tapped unless you control one or fewer other lands.
{T}: Add {B} or {R}.
Cycling {2}

Menace
Whenever Ignited Soul deals combat damage to a player, you may discard a card. If you do, draw a card.

When this creature enters, create a Treasure token.
Damned — At the beginning of your end step, this creature deals 1 damage to each opponent and you gain 1 life if you've sacrificed a permanent this turn.

[+2]: Mill three cards. You gain 3 life.
[+1]: Return target land card from your graveyard to the battlefield. It becomes a 2/2 black Zombie creature in addition to its other types.
[–2]: Target opponent sacrifices a nonland permanent with mana value 3 or greater.
[–12]: You get an emblem with “Whenever a player sacrifices a permanent, you may draw a card.” Then each opponent sacrifices five permanents.

Flash
Flying
When Swooping Hunter enters, create a Berry token, then you may return another creature you control to its owner's hand.

Whenever an opponent gains life or draws a card during your turn, you do the same.
[+1]: You may discard a card. If you do, each player may draw a card.
[+1]: For each player, up to one target creature they control gains vigilance and lifelink until end of turn.
[–7]: Choose a card type. Each opponent who controls more permanents of that type than you sacrifices a number equal to the difference.

When this creature enters, target creature you control gets +2/+2 until end of turn.
Plainscycling {2}