"Magic Origins", +~X (5)
Reveal the top X cards of your library. Put all land cards from among them onto the battlefield tapped and the rest on the bottom of your library in a random order.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, untap those lands.
Counter target spell unless its controller pays .
Return all nonland permanents with mana value X or less to their owners' hands.
Hangarback Walker enters with X +1/+1 counters on it.
When Hangarback Walker dies, create a 1/1 colorless Thopter artifact creature token with flying for each +1/+1 counter on Hangarback Walker.
, : Put a +1/+1 counter on Hangarback Walker.
Ravaging Blaze deals X damage to target creature.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, Ravaging Blaze also deals X damage to that creature's controller.
Gatherer works better in the Companion app!
, 
: Put a +1/+1 counter on Hangarback Walker.