As an additional cost to cast this spell, sacrifice a blue permanent.

Counter target spell.

Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.

At the beginning of your upkeep, destroy the creature with the least power. It can't be regenerated. If two or more creatures are tied for least power, you choose one of them.

When there are no creatures on the battlefield, sacrifice Drop of Honey.

{G}, Sacrifice a creature: Reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order.

{3}, {T}, Sacrifice a creature: Reveal a number of cards from the top of your library equal to the sacrificed creature's power. Put one into your hand and exile the rest.

Flying

{U}, Sacrifice Glen Elendra Archmage: Counter target noncreature spell.

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

You and permanents you control have protection from Salamanders.

At the beginning of your end step, each player who controls the fewest creatures creates a 4/3 blue Salamander Warrior creature token.

As an additional cost to cast this spell, sacrifice a creature.

Enchant creature

You control enchanted creature.

Enchanted creature gets +1/+1.

Sacrifice a creature: Draw cards equal to the sacrificed creature's power, then discard three cards.

As an additional cost to cast this spell, sacrifice a creature.

Draw cards equal to the sacrificed creature's power.

Exile all creatures you control, then reveal cards from the top of your library until you reveal that many creature cards. Put all creature cards revealed this way onto the battlefield, then shuffle the rest of the revealed cards into your library.

All creatures have "At the beginning of your upkeep, sacrifice this creature unless you pay {1}."

{1}, Sacrifice a creature: Search your library for a land card with a basic land type, put it onto the battlefield tapped, then shuffle.

Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of their library until they reveal a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into their library.

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Read ahead (Choose a chapter and start with that many lore counters. Add one after your draw step. Skipped chapters don't trigger. Sacrifice after III.)

I, II -- Another target nonland permanent phases out. It can't phase in for as long as you control The Phasing of Zhalfir.

III -- Destroy all creatures. For each creature destroyed this way, its controller creates a 2/2 black Phyrexian creature token.

When Uro enters the battlefield, sacrifice it unless it escaped.

Whenever Uro enters the battlefield or attacks, you gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield.

Escape--{G}{G}{U}{U}, Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)