Keyword: Haste

Haste
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Haste
Swampcycling , mountaincycling (, Discard this card: Search your library for a Swamp or Mountain card, reveal it, put it into your hand, then shuffle your library.)

Haste
Whenever Thraximundar attacks, defending player sacrifices a creature.
Whenever a player sacrifices a creature, you may put a +1/+1 counter on Thraximundar.

Flying, first strike, vigilance, trample, haste, protection from black and from red

Trample, haste
At the beginning of the end step, sacrifice Hellspark Elemental.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Haste
, : Create a 3/1 red Elemental creature token with haste.

Trample, haste
At the beginning of the end step, sacrifice Hellspark Elemental.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Haste
If a spell you control would deal damage to an opponent, prevent that damage. Create a 3/1 red Elemental Shaman creature token with haste for each 1 damage prevented this way.
When Hostility is put into a graveyard from anywhere, shuffle it into its owner’s library.

Haste
Whenever Slith Firewalker deals combat damage to a player, put a +1/+1 counter on it.

Affinity for Mountains (This spell costs less to cast for each Mountain you control.)
Haste

Haste
: Pyre Charger gets +1/+0 until end of turn.

Haste
: Target creature with power 5 or greater gains haste until end of turn.

Flying, haste
Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with twice that many +1/+1 counters on it.)

Flying, haste
At the beginning of the end step, sacrifice Hell’s Thunder.
Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Vigilance, haste

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

Haste

Haste
: Return Ashen Ghoul from your graveyard to the battlefield. Activate this ability only during your upkeep and only if three or more creature cards are above Ashen Ghoul.

First strike, haste

Flying, haste

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

Haste
Thunderblust has trample as long as it has a -1/-1 counter on it.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner’s control with a -1/-1 counter on it.)

Haste
Chroma — When Heartlash Cinder enters the battlefield, it gets +X/+0 until end of turn, where X is the number of red mana symbols in the mana costs of permanents you control.

Haste
Hotheaded Giant enters the battlefield with two -1/-1 counters on it unless you’ve cast another red spell this turn.

Haste
: Pyre Charger gets +1/+0 until end of turn.