Fear (This creature can't be blocked except by artifact creatures and/or black creatures.)

Return target instant or sorcery card from your graveyard to your hand.

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.)
When Revered Unicorn leaves the battlefield, you gain life equal to the number of age counters on it.

Roc Hatchling enters the battlefield with four shell counters on it.
At the beginning of your upkeep, remove a shell counter from Roc Hatchling.
As long as Roc Hatchling has no shell counters on it, it gets +3/+2 and has flying.

When Rogue Elephant enters the battlefield, sacrifice it unless you sacrifice a Forest.

Flying
When Sage Owl enters the battlefield, look at the top four cards of your library, then put them back in any order.

Whenever Sawtooth Ogre blocks or becomes blocked by a creature, Sawtooth Ogre deals 1 damage to that creature at end of combat.

If Scorched Ruins would enter the battlefield, sacrifice two untapped lands instead. If you do, put Scorched Ruins onto the battlefield. If you don't, put it into its owner's graveyard.
: Add .

At the beginning of your upkeep, destroy all artifacts and enchantments. They can't be regenerated.

Creatures you control have vigilance. (Attacking doesn't cause them to tap.)

: Put a -1/-1 counter on Serrated Biskelion and a -1/-1 counter on target creature.

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)

Return X target creature cards from your graveyard to your hand. You lose X life.

, Exile a creature card from your graveyard: You gain 1 life.

, : Destroy target red permanent.

You may exile the top three black cards of your graveyard rather than pay this spell's mana cost.
Spinning Darkness deals 3 damage to target nonblack creature. You gain 3 life.

You can't cast creature spells.

, Pay 2 life, Sacrifice a Swamp: Return target creature card from your graveyard to the battlefield.

When an opponent casts a creature spell, sacrifice Straw Golem.