You may pay rather than pay this spell's mana cost if there are thirteen or more creatures on the battlefield.
Each player sacrifices thirteen creatures of their choice.

Tap three untapped Elves you control: Add .

Whenever this creature attacks, target player mills half their library, rounded up.

You may have this creature assign its combat damage as though it weren't blocked.
: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

When this creature enters, choose one —
• Scry 2.
• You gain 3 life.
• Exile another target creature you own. Return it to the battlefield under your control at the beginning of the next end step.

Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

All Sliver creatures have "Whenever this creature is dealt damage, put a +1/+1 counter on it." (It must survive the damage to get the counter.)

Sacrifice an enchantment: This creature gets +1/+1 until end of turn.
Discard a card: This creature gets +1/+1 until end of turn.

During your turn, each creature assigns combat damage equal to its toughness rather than its power.
Whenever Baldin attacks, up to one hundred target creatures each get +0/+X until end of turn, where X is the number of cards in your hand.

During your turn, each creature assigns combat damage equal to its toughness rather than its power.
Whenever Baldin attacks, up to one hundred target creatures each get +0/+X until end of turn, where X is the number of cards in your hand.

Nyx Lotus enters tapped.
: Choose a color. Add an amount of mana of that color equal to your devotion to that color. (Your devotion to a color is the number of mana symbols of that color in the mana costs of permanents you control.)

Flying, trample
Pay 2 life: Surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

: Destroy target creature with power 4 or greater.

First strike, menace, trample
Partner (You can have two commanders if both have partner.)

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and no matter when it came under your control.)
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Spree (Choose one or more additional costs.)
+ — All creatures lose all abilities until end of turn.
+ — Choose a creature you control. It gains indestructible until end of turn.
+ — Destroy all creatures.

Spree (Choose one or more additional costs.)
+ — Mill four cards. You may put up to two creature and/or land cards from among the milled cards into your hand.
+ — You may put up to two creature cards from your hand onto the battlefield.
+ — Creatures you control with power 4 or greater gain hexproof and indestructible until end of turn.

Enrage — Whenever this creature is dealt damage, exile target creature an opponent controls until this creature leaves the battlefield.

As an additional cost to cast this spell, you may tap any number of untapped creatures you control. This spell costs less to cast for each creature tapped this way.
Explosive Singularity deals 10 damage to any target.

For each creature token on the battlefield, its controller creates a token that's a copy of that creature.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)