This creature can't block.

Flying
Prince of Chaos — When Be'lakor enters, you draw X cards and you lose X life, where X is the number of Demons you control.
Lord of Torment — Whenever another Demon you control enters, it deals damage equal to its power to any target.

This land enters tapped unless you control two or fewer other lands.
: Add or .

Counter target activated ability, triggered ability, or legendary spell.

Play with Fire deals 2 damage to any target. If a player is dealt damage this way, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Enchant artifact or land
Enchanted permanent has ": Target player adds two mana of any one color. The next spell they cast this turn has cascade." (When they cast their next spell, they exile cards from the top of their library until they exile a nonland card that costs less. They may cast it without paying its mana cost. They put the exiled cards on the bottom in a random order.)

Negative — As long as K-9 is untapped, other legendary creatures you control have ward .
Affirmative — , : Target legendary creature can't be blocked this turn.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Flash
You may cast noncreature spells as though they had flash.
Whenever you cast a noncreature spell, Birds, Frogs, Otters, and Rats you control get +1/+1 until end of turn. Untap them.

This land enters tapped unless you have two or more opponents.
: Add or .

Dark Depths enters with ten ice counters on it.
: Remove an ice counter from Dark Depths.
When Dark Depths has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

Sacrifice a land. Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle. If you control a creature with power 4 or greater, instead search your library for up to three basic land cards, put them onto the battlefield tapped, then shuffle.

Undaunted (This spell costs less to cast for each opponent.)
Return all nonland permanents to their owners' hands.

: Add .
: Put an hour counter on this artifact.
At the beginning of each upkeep, put an hour counter on this artifact.
When the twelfth hour counter is put on this artifact, shuffle your hand and graveyard into your library, then draw seven cards. Exile this artifact.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
Whenever another nontoken creature you control dies, draw a card.

All artifacts have "At the beginning of your upkeep, sacrifice this artifact unless you pay ."

Creatures you control have haste.
Whenever a creature you control with power 4 or greater enters, you may draw a card.

Affinity for Elves (This spell costs less to cast for each Elf you control.)
When this creature enters, mill four cards, then put all Elf cards from among them into your hand.

If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead.

Flying, first strike, trample, lifelink, haste
At the beginning of combat on your turn, other Spiders you control gain flying, first strike, trample, lifelink, and haste until end of turn.

Flying, haste
Whenever one or more Dragons you control attack an opponent, goad target creature that player controls.
Whenever a creature deals combat damage to one of your opponents, if that creature had to attack this combat, you put a +1/+1 counter on Firkraag and you draw a card.