, Discard a card: Draw a card.

, Discard a card: Put a -1/-1 counter on target creature. That creature can't block this turn.

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

, Discard a card: Draw a card.

Mindless Automaton enters the battlefield with two +1/+1 counters on it.

, Discard a card: Put a +1/+1 counter on Mindless Automaton.

Remove two +1/+1 counters from Mindless Automaton: Draw a card.

Deathtouch, haste

, Discard a card: Draw a card. If the discarded card was a creature card, amass Orcs 1. (Put a +1/+1 counter on an Army you control. It's also an Orc. If you don't control an Army, create a 0/0 black Orc Army creature token first.)

, Discard a card: Target creature gets +2/+2 until end of turn.

, Sacrifice Narcissism: Target creature gets +2/+2 until end of turn.

Flying

Hellbent — Necromancer's Familiar has lifelink as long as you have no cards in hand.

, Discard a card: Necromancer's Familiar gains indestructible until end of turn. Tap it.

, Discard a card: Target opponent loses 1 life and you gain 1 life.

Hellbent — , Pay 2 life: Draw a card. Activate only if you have no cards in hand.

, , Discard a card: Destroy target nonblack creature. It can't be regenerated.

Discard a card: Olivia's Dragoon gains flying until end of turn.

, Discard a card: Draw a card.

Pack Rat's power and toughness are each equal to the number of Rats you control.

, Discard a card: Create a token that's a copy of Pack Rat.

Discard a card: Patrol Hound gains first strike until end of turn.

, Discard a card: Create a 1/1 white Pegasus creature token with flying.

Sacrifice an enchantment: Phantatog gets +1/+1 until end of turn.

Discard a card: Phantatog gets +1/+1 until end of turn.

, Discard a card: Draw a card.

, : Reveal cards from the top of your library until you reveal a nonlegendary, nonland card with mana value 3 or less. You may cast that card without paying its mana cost. Put all revealed cards not cast this way on the bottom of your library in a random order.

Flying

Discard a card: Prognostic Sphinx gains hexproof until end of turn. Tap it.

Whenever Prognostic Sphinx attacks, scry 3.

Discard a card: Psychatog gets +1/+1 until end of turn.

Exile two cards from your graveyard: Psychatog gets +1/+1 until end of turn.

Discard a card: Putrid Imp gains flying until end of turn.

Threshold — As long as seven or more cards are in your graveyard, Putrid Imp gets +1/+1 and can't block.

Discard a card: Ravenous Bloodseeker gets +2/-2 until end of turn.

, , Discard a card: Target creature gets +1/+0 and gains first strike until end of turn.

, , Discard a card: Regenerate target creature.

, Discard a card: Create a 0/3 blue Crab creature token.

Delirium — Crabs you control get +1/+1 as long as there are four or more card types among cards in your graveyard.

, , Discard a card: Target player mills three cards.

, , Discard a card: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

, , Discard a card: Create a 1/1 black Zombie Goblin creature token named Festering Goblin. It has "When Festering Goblin dies, target creature gets -1/-1 until end of turn."

: You gain 1 life.

, Discard a card: You gain 3 life.

, , Discard a card: Create a 1/1 colorless Sliver artifact creature token named Metallic Sliver.

, , Discard a card: Create a 3/1 red Elemental creature token named Spark Elemental. It has trample, haste, and "At the beginning of the end step, sacrifice Spark Elemental."

, , Discard a card: Creatures you control get +1/+1 and gain trample until end of turn.

Discard a card: Vampires you control get +1/+1 until end of turn. Activate only once each turn.

, , Discard a card: Counter target noncreature spell.

Shadow (This creature can block or be blocked by only creatures with shadow.)

Discard a card: Return Thalakos Scout to its owner's hand.

, , Discard a card: Create a 1/1 white Human Soldier creature token.

Discard a card: Tireless Tribe gets +0/+4 until end of turn.

Menace

, Discard a card: Tomb Robber explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

, , Discard a card: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn. <I>(It retains its abilities.)</I>

Discard a card: Prevent all damage that would be dealt to Trained Pronghorn this turn.

, , Discard a card: You may tap or untap target artifact, creature, or land.

, Discard a card: Return Undead Gladiator from your graveyard to your hand. Activate only during your upkeep.

Cycling (, Discard this card: Draw a card.)

, , Discard a card: Each other player loses 2 life. You gain life equal to the life lost this way.

, Discard a card: Creatures you control gain haste until end of turn.

, , Discard a card: Look at the top X cards of your library. You may put a creature card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

, , Discard a card: Return target creature to its owner's hand.

Flying

Whenever one or more creatures deal combat damage to you, each opponent sacrifices a creature that dealt combat damage to you this turn. The Ring tempts you.

Discard a card: Witch-king of Angmar gains indestructible until end of turn. Tap it.