This spell costs less to cast for each creature card in your graveyard.

Whenever Gloom Sower becomes blocked by a creature, that creature's controller loses 2 life and you gain 2 life.

Vigilance
: Create an 8/8 Beast creature token that's red, green, and white.

Flying

Suspend 10—
Sacrifice an artifact, creature, or land: Remove a time counter from Greater Gargadon. Activate this ability only if Greater Gargadon is suspended.

Grief Tyrant enters the battlefield with four -1/-1 counters on it.
When Grief Tyrant dies, put a -1/-1 counter on target creature for each -1/-1 counter on Grief Tyrant.

Trample
, Convert a Transformers toy you own to its other mode: Grimlock, Ferocious King becomes Grimlock, Dinobot Leader.

Other creatures have "Whenever this creature attacks, you may have it fight Grothama, All-Devouring."
When Grothama leaves the battlefield, each player draws cards equal to the amount of damage dealt to Grothama this turn by sources they controlled.

Defender (This creature can't attack.)
When Grozoth enters the battlefield, you may search your library for any number of cards that have converted mana cost 9, reveal them, and put them into your hand. If you do, shuffle your library.
: Grozoth loses defender until end of turn.
Transmute (, Discard this card: Search your library for a card with the same converted mana cost as this card, reveal it, and put it into your hand. Then shuffle your library. Transmute only as a sorcery.)

Flying, trample, haste
: Hellkite Overlord gets +1/+0 until end of turn.
: Regenerate Hellkite Overlord.

You can't spend mana to cast this spell.
Convoke, delve (Each creature you tap while casting this spell pays for or one mana of that creature's color. Each card you exile from your graveyard pays for .)
You may cast Hogaak, Arisen Necropolis from your graveyard.
Trample

When Hunted Troll enters the battlefield, target opponent creates four 1/1 blue Faerie creature tokens with flying.
: Regenerate Hunted Troll.

Whenever Hydra Omnivore deals combat damage to an opponent, it deals that much damage to each other opponent.

Flying
When Hypnox enters the battlefield, if you cast it from your hand, exile all cards from target opponent's hand.
When Hypnox leaves the battlefield, return the exiled cards to their owner's hand.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Indestructible

When Iname as One enters the battlefield, if you cast it from your hand, you may search your library for a Spirit permanent card, put it onto the battlefield, then shuffle your library.
When Iname as One dies, you may exile it. If you do, return target Spirit permanent card from your graveyard to the battlefield.

Flying, first strike, trample
Once each turn, while you're searching your library, you may pay , reveal Infernal Spawn of Infernal Spawn of Evil from your library and say "I'm coming, too!" If you do, Infernal Spawn of Infernal Spawn of Evil deals 2 damage to a player of your choice.

Flying, first strike, trample, haste
This spell costs less to cast for each card you've revealed this turn.
When Infernius Spawnington III, Esq. enters the battlefield, you may say "I'm here." If you do, it deals 3 damage to target player.

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents.)
Whenever an opponent sacrifices a nontoken permanent, put that card onto the battlefield under your control.