Choose a number between 0 and 13. Each player sacrifices that many creatures of their choice.

Flying
Whenever you cast a creature spell with mana value 3 or less, investigate.

Equipped creature has lifelink.
As long as you have 30 or more life, equipped creature gets +5/+5 and has indestructible and "Prevent all damage that would be dealt to this creature."
Equip

Enchant creature
Enchanted creature can't attack or block.
: Return this Aura to its owner's hand.

Enchant creature
Enchanted creature gets +2/+2 and can't attack.

Exile all graveyards. Players can't cast noncreature spells this turn. Exile Calamity's Wake.

Shroud
Vanishing 4

Return target creature card with mana value 3 or less from your graveyard to the battlefield. Put a flying counter on it. It's a Spirit in addition to its other types.

Revolt — At the beginning of your end step, if a permanent left the battlefield under your control this turn, put a unity counter on this enchantment.
Creatures you control get +1/+1 for each unity counter on this enchantment.

Create two 2/2 white Knight creature tokens with vigilance.

Strive — This spell costs more to cast for each target beyond the first.
Choose any number of target opponents. Create X 1/1 white Human Soldier creature tokens, where X is the number of creatures those opponents control.

Search your library for a planeswalker card, reveal it, put it into your hand, then shuffle.

As this enchantment enters, choose a color and an opponent.
White creatures get +1/+1 as long as the chosen color is the most common color among nontoken permanents the chosen player controls but isn't tied for most common.
When the chosen color isn't the most common color among nontoken permanents the chosen player controls or is tied for most common, sacrifice this enchantment.

Untap all creatures you control. Samurai creatures you control get +1/+1 until end of turn.

Enchant nonblack creature
Enchanted creature gets +1/+2, has flying, and is an Angel in addition to its other types.

, : This creature loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay to end this effect.
Enchanted creature can't attack.

Banding
As long as this creature is attacking, prevent all damage Deserts would deal to this creature and to creatures banded with this creature.

, Exile this card from your graveyard: Empower Jace 2.

Flash
When Candela enters, return up to one target creature you control to its owner's hand. It perpetually gets +1/+1.
Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft. Station only as a sorcery. It's an artifact creature at 8+.)
8+: Flying
Whenever Candela deals combat damage to a player, you may put a creature card with mana value 3 or less from your hand onto the battlefield.
3/3

Coven — At the beginning of combat on your turn, if you control three or more creatures with different powers, this creature gains flying until end of turn.

Enchant creature
Enchanted creature gets +3/+2 and has vigilance.

Prevent the next 3 damage that would be dealt to any target this turn. You gain life equal to the damage prevented this way.
Splice onto Arcane

Enchant creature
Enchanted creature has defender.
Prevent all combat damage that would be dealt by enchanted creature.
Coven — , Sacrifice this Aura: Exile enchanted creature. Activate only if you control three or more creatures with different powers.

Landfall — Whenever a land you control enters, creatures you control get +1/+1 until end of turn.

Whenever this creature saddles a Mount or crews a Vehicle during your main phase, that Mount or Vehicle gains flying until end of turn.

First strike
: This creature gets +1/+0 until end of turn.

Enchant creature
Enchanted creature gets +1/+1.
, Sacrifice this Aura: Draw a card.

: This creature gets +0/+1 until end of turn.

, , Sacrifice this creature: Destroy target artifact or enchantment.

Flash
Vigilance
Devour artifact 1