Commander

Casting Cost: 

Creatures can't attack you unless their controller pays  for each creature he or she controls that's attacking you.

Casting Cost:

Whenever a creature attacks you or a planeswalker you control, that creature's controller puts the top two cards of his or her library into his or her graveyard.

Casting Cost:

: Exile target card from a graveyard. If it was a creature card, put a +1/+1 counter on Scavenging Ooze and you gain 1 life.

Casting Cost:

As Sewer Nemesis enters the battlefield, choose a player.

Sewer Nemesis's power and toughness are each equal to the number of cards in the chosen player's graveyard.

Whenever the chosen player casts a spell, that player puts the top card of his or her library into his or her graveyard.

Casting Cost:

Haste

Whenever Skullbriar, the Walking Grave deals combat damage to a player, put a +1/+1 counter on it.

Counters remain on Skullbriar as it moves to any zone other than a player's hand or library.

Casting Cost:

Equipped creature gets +1/-1.

Whenever equipped creature dies, draw two cards.

Equip 

Casting Cost:

: Add  to your mana pool.

Casting Cost: 

When Solemn Simulacrum enters the battlefield, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle your library.

When Solemn Simulacrum dies, you may draw a card.

Casting Cost:

Counter target spell. If that spell is countered this way, put it on the bottom of its owner's library instead of into that player's graveyard. Put Spell Crumple on the bottom of its owner's library.

Casting Cost:

Your opponents can't search libraries.

If an opponent would begin an extra turn, that player skips that turn instead.

Casting Cost:

As The Mimeoplasm enters the battlefield, you may exile two creature cards from graveyards. If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.

Casting Cost:

Flying, lifelink

Sacrifice a creature: Put X +1/+1 counters on Vish Kal, Blood Arbiter, where X is the sacrificed creature's power.

Remove all +1/+1 counters from Vish Kal: Target creature gets -1/-1 until end of turn for each +1/+1 counter removed this way.

Casting Cost:

Defender

When Wall of Omens enters the battlefield, draw a card.

Casting Cost: 

Each player discards his or her hand, then draws cards equal to the greatest number of cards a player discarded this way.