Flying, vigilance

Flying
Landfall — Whenever a land enters the battlefield under your control, Akoum Hellkite deals 1 damage to any target. If that land is a Mountain, Akoum Hellkite deals 2 damage instead.

Trample, hexproof

Reach
: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)
When Arbor Colossus becomes monstrous, destroy target creature with flying an opponent controls.

Instant and sorcery spells cost less to cast.

: Mill a card.
Delirium — At the beginning of your end step, if there are four or more card types among cards in your graveyard, transform Autumnal Gloom.

Enchant Mountain
Enchanted Mountain is a 7/7 red Giant creature with haste. It's still a land.

Put nine +1/+1 counters on target land you control. It becomes a legendary 0/0 Elemental creature with haste named Vitu-Ghazi. It's still a land.

Flying
When Balustrade Spy enters the battlefield, target player reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.

Delve (Each card you exile from your graveyard while casting this spell pays for .)
Target creature gets +6/+6 until end of turn.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)

When you cast this spell, you may put two cards your opponents own from exile into their owners' graveyards. If you do, create three 1/1 colorless Eldrazi Scion creature tokens. They have "Sacrifice this creature: Add ."

At the beginning of your upkeep, if you control a black permanent, you may put a +1/+1 counter on Bloodhall Ooze.
At the beginning of your upkeep, if you control a green permanent, you may put a +1/+1 counter on Bloodhall Ooze.

Boneyard Wurm's power and toughness are each equal to the number of creature cards in your graveyard.

Enchant nonblack creature
Enchanted creature gets +1/+2, has flying, and is an Angel in addition to its other types.

When Carrion Thrash dies, you may pay . If you do, return another target creature card from your graveyard to your hand.

Castle Embereth enters the battlefield tapped unless you control a Mountain.
: Add .
, : Creatures you control get +1/+0 until end of turn.

Whenever a creature without flying attacks you or a planeswalker you control, Circle of Flame deals 1 damage to that creature.

Enchant creature
As long as enchanted creature is blue, it gets +1/+1 and has shroud. (It can't be the target of spells or abilities.)
As long as enchanted creature is red, it gets +1/+1 and has haste.

You may reveal an Eldrazi card you own from outside the game or choose a face-up Eldrazi card you own in exile. Put that card into your hand.