Scry 4, then draw two cards.

Each creature card in your graveyard has scavenge. The scavenge cost is equal to its mana cost. (Exile a creature card from your graveyard and pay its mana cost: Put a number of +1/+1 counters equal to that card's power on target creature. Scavenge only as a sorcery.)
Sacrifice another creature: Regenerate Varolz.

Vigilance

(Gain the next level as a sorcery to add its ability.)
Whenever you attack, put a +1/+1 counter on target attacking creature.
: Level 2
Whenever a creature you control leaves the battlefield, if it had a counter on it, you gain 2 life.
: Level 3
Whenever you cast a spell, put a +1/+1 counter on each creature you control.

Deathtouch

When Sarkhan enters, you may behold a Dragon. If you do, create a Treasure token. (To behold a Dragon, choose a Dragon you control or reveal a Dragon card from your hand.)
Whenever a Dragon you control enters, put a +1/+1 counter on Sarkhan. Until end of turn, Sarkhan becomes a Dragon in addition to its other types and gains flying.

( can be paid with either or .)
Flying
Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies.)

Sarkhan's Rage deals 5 damage to any target. If you control no Dragons, Sarkhan's Rage deals 2 damage to you.

When this creature enters, target opponent skips their next combat phase.

Creatures you control get +1/+1 until end of turn.
Forecast — , Reveal this card from your hand: Target creature gets +1/+1 until end of turn. (Activate only during your upkeep and only once each turn.)

This spell can't be countered.
Lithomantic Barrage deals 1 damage to target creature or planeswalker. It deals 5 damage instead if that target is white and/or blue.

Enchant land
When this Aura enters, put a +1/+1 counter on target creature you control.
Enchanted land has ": Add two mana of any one color."

This land enters tapped.
As this land enters, choose a color other than black.
: Add or one mana of the chosen color.

Creature spells you cast have demonstrate. (Whenever you cast a creature spell, you may copy it. If you do, choose an opponent to also copy it. Each copy becomes a token.)

This creature can't block creatures with power 2 or greater.

Choose one —
• Abrade deals 3 damage to target creature.
• Destroy target artifact.

Enchant planeswalker
Enchanted planeswalker has "[+1]: Up to one target creature gets +2/+0 and gains first strike and trample until end of turn."
Whenever you activate a loyalty ability of enchanted planeswalker, copy that ability. You may choose new targets for the copy.

This spell costs less to cast for each instant and sorcery card in your graveyard.
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When this creature enters, discard your hand, then draw three cards.

Flying
Non-Archon creatures have base power and toughness 3/3.
When this creature enters, create two 1/1 white Human creature tokens.

Draw two cards, then discard two cards.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)