Flying
When Abhorrent Overlord enters the battlefield, create a number of 1/1 black Harpy creature tokens with flying equal to your devotion to black. (Each in the mana costs of permanents you control counts toward your devotion to black.)
At the beginning of your upkeep, sacrifice a creature.

Enchant creature
Enchanted creature has hexproof and can't be blocked by more than one creature.

: Target white creature gains persist until end of turn. (When it 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.)

Trample
Cumulative upkeep or (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.)
When Arctic Nishoba dies, you gain 2 life for each age counter on it.

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.)
Whenever Balduvian Fallen's cumulative upkeep is paid, it gets +1/+0 until end of turn for each or spent this way.

At the beginning of your upkeep, if you control no permanents other than Barren Glory and have no cards in hand, you win the game.

When Batterhorn enters the battlefield, you may destroy target artifact.

Blackcleave Cliffs enters the battlefield tapped unless you control two or fewer other lands.
: Add or .

Blazethorn Scarecrow has haste as long as you control a red creature.
Blazethorn Scarecrow has wither as long as you control a green creature. (It deals damage to creatures in the form of -1/-1 counters.)

Bloodcrazed Neonate attacks each combat if able.
Whenever Bloodcrazed Neonate deals combat damage to a player, put a +1/+1 counter on it.

When Brain Maggot enters the battlefield, target opponent reveals their hand and you choose a nonland card from it. Exile that card until Brain Maggot leaves the battlefield.

Creatures you control have vigilance.
Each creature you control can block an additional creature each combat.

Flying
When Cadaver Imp enters the battlefield, you may return target creature card from your graveyard to your hand.

Shroud (This creature can't be the target of spells or abilities.)
Vanishing 4 (This creature enters the battlefield with four time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Creatures you control gain double strike until end of turn. (They deal both first-strike and regular combat damage.)

Destroy target nonblack creature that entered the battlefield this turn.

Crumbling Necropolis enters the battlefield tapped.
: Add , , or .