( 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.)

Flying
At the beginning of your upkeep, you may gain control of target permanent until end of turn. If you do, untap it and it gains haste until end of turn.

[+1]: Look at the top card of your library. If it's a creature card, you may reveal it and put it into your hand.
[−2]: Target creature you control fights another target creature.
[−7]: You get an emblem with "Creatures you control have double strike, trample, hexproof, and haste."

Put a +1/+1 counter on target creature you control. Then that creature deals damage equal to its power to target creature or planeswalker you don't control.

Trample
When Domri's Nodorog enters the battlefield, you may search your library and/or graveyard for a card named Domri, City Smasher, reveal it, and put it into your hand. If you search your library this way, shuffle it.

Creatures you control get +1/+0.
[+1]: Add or . Creature spells you cast this turn can't be countered.
[−2]: Target creature you control fights target creature you don't control.

[+1]: Add or . If that mana is spent on a creature spell, it gains riot. (It enters the battlefield with your choice of a +1/+1 counter or haste.)
[−3]: Look at the top four cards of your library. You may reveal up to two creature cards from among them and put them into your hand. Put the rest on the bottom of your library in a random order.
[−8]: You get an emblem with "At the beginning of each end step, create a 4/4 red and green Beast creature token with trample."

[+2]: Creatures you control get +1/+1 and gain haste until end of turn.
[−3]: Domri, City Smasher deals 3 damage to any target.
[−8]: Put three +1/+1 counters on each creature you control. Those creatures gain trample until end of turn.

At the beginning of each player's upkeep, that player sacrifices a nonland, nontoken permanent. If that player can't, they discard a card, they lose 2 life, you draw a card, you gain 2 life, you create a 2/2 white Knight creature token with vigilance, then you sacrifice Doom Foretold.

Trample
At the beginning of your upkeep, sacrifice a creature. You gain life equal to that creature's toughness.

Flying
When Doomsday Specter enters the battlefield, return a blue or black creature you control to its owner's hand.
Whenever Doomsday Specter deals combat damage to a player, look at that player's hand and choose a card from it. The player discards that card.

Each creature assigns combat damage equal to its toughness rather than its power.

All Sliver creatures have defender.
All Slivers have "When this permanent enters the battlefield, draw a card."

Target creature gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Counter up to two target spells.

( can be paid with either or .)
Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's converted mana cost.

[+1]: Until your next turn, up to one target creature gets -3/-0 and its activated abilities can't be activated.
[−1]: You gain 2 life and draw a card.
[−7]: You get an emblem with "Your opponents can't untap more than two permanents during their untap steps."

When Dovin's Acuity enters the battlefield, you gain 2 life and draw a card.
Whenever you cast an instant spell during your main phase, you may return Dovin's Acuity to its owner's hand.

Put up to one target tapped creature on top of its owner's library. You may search your library and/or graveyard for a card named Dovin, Architect of Law, reveal it, and put it into your hand. If you search your library this way, shuffle it.

This spell can't be countered.
Counter target noncreature spell.