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Return How to Keep an Izzet Mage Busy to its owner's hand.

Target creature gets +X/+0 until end of turn.

Flash
Enchant creature
When Howl of the Hunt enters the battlefield, if enchanted creature is a Wolf or Werewolf, untap that creature.
Enchanted creature gets +2/+2 and has vigilance.

Create a 2/2 green Wolf creature token for each Forest you control.

Creatures with power less than Howlgeist's power can't block it.
Undying

Flying
When Howling Banshee enters the battlefield, each player loses 3 life.

Creatures with power less than Howling Chorus's power can't block it.
Whenever Howling Chorus deals combat damage to a player, create a 3/2 colorless Eldrazi Horror creature token.

Target creature gets +4/+0 until end of turn.

Whenever Howling Golem attacks or blocks, each player draws a card.

At the beginning of each player's draw step, if Howling Mine is untapped, that player draws an additional card.

At the beginning of combat on your turn, target Wolf or Werewolf you control gets +2/+2 until end of turn.
Whenever an opponent casts their second spell each turn, create a 2/2 green Wolf creature token.

When Howling Wolf enters the battlefield, you may search your library for up to three cards named Howling Wolf, reveal them, put them into your hand, then shuffle.

Each other creature you control that's a Werewolf or a Wolf gets +1/+1.
At the beginning of your end step, create a 2/2 green Wolf creature token.
At the beginning of each upkeep, if a player cast two or more spells last turn, transform Howlpack Alpha.

Whenever a permanent you control is dealt damage, Howlpack Avenger deals that much damage to any target.
{1}{R}: Howlpack Avenger gets +2/+0 until end of turn.
Nightbound

This spell can't be countered.
{1}{G}, {T}: You may put a creature card from your hand onto the battlefield. If it's a Wolf or Werewolf, untap Howlpack Piper. Activate only as a sorcery.
Daybound

Flash
Each creature you control that's a Wolf or a Werewolf gets +1/+1 and has trample.

Howlpack Wolf can't block unless you control another Wolf or Werewolf.

Hideaway 4
Howltooth Hollow enters the battlefield tapped.
{T}: Add {B}.
{B}, {T}: You may play the exiled card without paying its mana cost if each player has no cards in hand.

{T}: Put target creature card from your graveyard on top of your library. Activate only during your turn, before attackers are declared.

Huang Zhong, Shu General can't be blocked by more than one creature.

Each creature you control assigns combat damage equal to its toughness rather than its power.
[–3]: You gain life equal to the greatest toughness among creatures you control.

Hulking Cyclops can't block.

Hulking Goblin can't block.

Hulking Ogre can't block.