Each creature you control can block an additional creature each combat.

Flying
Whenever Hollow Specter deals combat damage to a player, you may pay . If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.

Haste
At the beginning of the end step, sacrifice Ichorid.
At the beginning of your upkeep, if Ichorid is in your graveyard, you may exile a black creature card other than Ichorid from your graveyard. If you do, return Ichorid to the battlefield.

When Infectious Host dies, target player loses 2 life.

First strike, haste
: Jeska, Warrior Adept deals 1 damage to any target.

Whenever an opponent casts a spell, Kaervek the Merciless deals damage to any target equal to that spell's converted mana cost.

, : Choose target opponent who controlled more creatures than you did as you activated this ability. Create a 2/2 green Beast creature token.

: Destroy target creature blocking Knight of Dusk.

Enchant creature
Enchanted creature has swampwalk. (It can't be blocked as long as defending player controls a Swamp.)

Flying, vigilance, haste

, : Search your library for a Rebel permanent card with converted mana cost X or less and put it onto the battlefield. Then shuffle your library.
: Put target Rebel card from your graveyard on the bottom of your library.

, : Target player draws a card, then discards a card. If that player discards an artifact card this way, untap Lumengrid Augur.

Flying
Will of the council — When Magister of Worth enters the battlefield, starting with you, each player votes for grace or condemnation. If grace gets more votes, each player returns each creature card from their graveyard to the battlefield. If condemnation gets more votes or the vote is tied, destroy all creatures other than Magister of Worth.

At the beginning of each player's end step, put a charge counter on Mana Cache for each untapped land that player controls.
Remove a charge counter from Mana Cache: Add . Any player may activate this ability but only during their turn before the end step.

Flying
Whenever Merfolk Skyscout attacks or blocks, untap target permanent.

Target creature gets +2/+2 and gains flying until end of turn.

Target opponent reveals cards from the top of their library until four land cards are revealed. That player puts all cards revealed this way into their graveyard.

Players can't search libraries.

: Untap Morphling.
: Morphling gains flying until end of turn.
: Morphling gains shroud until end of turn. (It can't be the target of spells or abilities.)
: Morphling gets +1/-1 until end of turn.
: Morphling gets -1/+1 until end of turn.