Flash
This spell costs less to cast, where X is the total power of creatures you control with flying.
Flying

Whenever you cast a creature spell, you may pay . If you do, return target creature to its owner's hand.

You may have this creature assign its combat damage as though it weren't blocked.

As an additional cost to cast this spell, discard X cards.
Search your library for X cards, then shuffle and put those cards on top in any order.

Create a 6/6 green Wurm creature token.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Defender (This creature can't attack.)
: Regenerate this creature.

Champion a Goblin or Shaman (When this enters, sacrifice it unless you exile another Goblin or Shaman you control. When this leaves the battlefield, that card returns to the battlefield.)
: This creature deals 3 damage to any target.

Horsemanship (This creature can't be blocked except by creatures with horsemanship.)
When Sun Ce enters, you may return target creature to its owner's hand.

, Pay 1 life: Add one mana of any color.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after IV.)
I, II — Destroy up to one target nonland permanent.
III — Draw two cards.
IV — Mega Flare — This creature deals damage equal to the total mana value of other permanents you control to each opponent.
Flying

: Add .
Sacrifice this artifact: Add .

You have no maximum hand size.
: Add .

When you cast this spell, target opponent exiles the top half of their library, rounded up.
Ward—Sacrifice two permanents.
Ulamog enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile.
Ulamog has annihilator X, where X is the number of +1/+1 counters on it.

No more than two creatures can attack each combat.
No more than two creatures can block each combat.

Equipped creature gets +2/+2 and has protection from white and from black.
Whenever equipped creature deals combat damage to a player, you gain 3 life and you may return up to one target creature card from your graveyard to your hand.
Equip

, Pay 1 life, Sacrifice this land: Search your library for an Island or Mountain card, put it onto the battlefield, then shuffle.

, , Exile this artifact: The next time you would draw a card this turn, instead put a card you own from outside the game into your hand.

When Dogmeat enters, mill five cards, then return an Aura or Equipment card from your graveyard to your hand.
Whenever a creature you control that's enchanted or equipped attacks, create a Junk token. (It's an artifact with ", Sacrifice this token: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.")

(: Add or .)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

If this card is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it. If you do, exile a card from your hand.
: Add . If Gemstone Caverns has a luck counter on it, instead add one mana of any color.