At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land of their choice.

Enchant land
Enchanted land has ", Discard a card: Gain control of target creature until end of turn."

Return target creature card from your graveyard to the battlefield.

Other creatures you control get +0/+1.

Whenever you win a coin flip, put a luck counter on this enchantment.
At the beginning of your upkeep, if this enchantment has ten or more luck counters on it, you win the game.

Flying, protection from red

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature dies, you may draw a card.

First strike
Discard a card: This creature gains protection from the color of your choice until end of turn.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
: This creature gets +1/+1 until end of turn.

Flying, protection from green

Flying
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +2/+2 and can't block.

If damage would be dealt to you, put that many delay counters on this enchantment instead.
At the beginning of your upkeep, remove all delay counters from this enchantment. For each delay counter removed this way, you lose 1 life unless you pay .

Haste
If this card is in a graveyard, effects from spells named Flame Burst count it as a card named Flame Burst.

Threshold — As long as there are seven or more cards in your graveyard, this creature gets +1/+1 and has flying.

Haste (This creature can attack and as soon as it comes under your control.)
Magnivore's power and toughness are each equal to the number of sorcery cards in all graveyards.

This creature can't attack unless defending player controls an Island.
, Sacrifice an Island: Target land becomes an Island until end of turn.

Return target permanent to its owner's hand.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Threshold — This creature gets +2/+2 as long as there are seven or more cards in your graveyard.

Scorching Missile deals 4 damage to target player or planeswalker.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying (This creature can't be blocked except by creatures with flying or reach.)
When this creature enters, destroy target enchantment.

Untap target creature. After this main phase, there is an additional combat phase followed by an additional main phase.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Destroy target artifact or enchantment.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature can't be blocked this turn.
Draw a card.

: This creature gets +0/+1 until end of turn.
: This creature can block an additional creature this turn.

Threshold — This creature gets +7/+7 as long as there are seven or more cards in your graveyard.

: Target player draws two cards, then discards two cards.

Create a 3/3 green Elephant creature token.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

First strike

Flying
Your maximum hand size is reduced by four.

, : Reveal the top card of your library. If it's a creature card, put it onto the battlefield. Otherwise, put it into your graveyard.

When this creature enters, you may return target creature card from your graveyard to your hand.

This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, sacrifice this creature unless you remove a +1/+1 counter from it.
, Discard a card: Put a +1/+1 counter on this creature.

Put target creature on top of its owner's library.

Destroy target artifact.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

, Mill a card: For each colored mana symbol in the milled card's mana cost, add one mana of that color. Activate only as an instant. (For example, if the card's mana cost is , you add .)

This creature can't be blocked by Walls.
Threshold — As long as there are seven or more cards in your graveyard, this creature gets +3/+0 and attacks each combat if able.