This spell can't be countered.
Trample
Hexproof from mana value 3 or less

At the beginning of your upkeep, return a permanent you control to its owner's hand.
You may play an additional land on each of your turns.

At the beginning of combat on your turn, if there are seven or more loyalty counters on Ameret, they become a 5/5 Angel creature with flying and indestructible until end of turn.
[+1]: Create a 1/1 red and white Cleric creature token with lifelink and haste.
[–X]: Ameret deals X damage to any target. You gain X life.

When Lunar Vigil enters, draw a card, then scry 2.
If you would draw one or more cards, you may instead put a night counter on Lunar Vigil and draw that many cards minus one.
Sacrifice Lunar Vigil: Target player draws a card and adds {R} for each night counter on it.

Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle. You gain 2 life.
Invoke {X}{G}{U}

Enchant Totem
As Worldspan Totem enters, put X +1/+1 counters on enchanted Totem.
Enchanted Totem has flying.

Flying
When Threzak, the Heinous enters, choose up to three. You lose 3 life for each mode you choose.
• Put three +1/+1 counters on Threzak.
• Target creature gets -3/-3 until end of turn.
• Draw three cards.

Whenever you scry, put a loyalty counter on Amos, Rune-Mage.
[+1]: Create a Glyph token.
[–1]: Return target creature to its owner's hand.
[–5]: Draw three cards.

Flash
Flying
When Serene Mediator enters, counter target noncreature spell unless its controller pays {1}.

Trample
Whenever Dawnglade Wildbear deals combat damage to a player, return a permanent you control to its owner's hand.

Mill five cards. When you do, you may return a creature card from your graveyard to the battlefield.

When Codename: Viridian enters, choose first strike, haste, lifelink, reach, or trample. Create a Gadget of that type, then attach it to her.
Noncreature, non-Equipment spells cost {1} more to cast for each permanent attached to Codename: Viridian.

Surveil 1.
Draw a card.

Whenever you cast a black spell or an artifact spell, each opponent loses 1 life and you gain 1 life.
Whenever you cast a nonblack, nonartifact spell, you lose 1 life.

Lifelink
As long as an opponent has 10 or less life, Myrkalt gets +2/+2 and has menace.
Glory

I, II — Each player loses 2 life.
III — Exile Legend of Myrkalt, then return it to the battlefield.

Chromatic Dragon is all colors.
Spend only colored mana produced by effects that add mana of any color to cast Chromatic Dragon or to activate its activated abilities.
Flying, ward {1}, haste
{1}: Chromatic Dragon gets +1/+1 until end of turn.

Ferocious Flame deals 2 damage to any target. If you control a creature with power 4 or greater, it deals 4 damage instead.

When Paleontologist enters, search your library for up to two artifact and/or Skeleton cards and put them into your graveyard, then shuffle.

Menace
When Anigul, the Setting Sun enters, each opponent discards a card.
Whenever Anigul deals combat damage to an opponent, exile up to two target cards from that player's graveyard. For each of those exiled cards, Anigul deals 1 damage to that card's owner.

Chromatic Dragon is all colors.
Spend only colored mana produced by effects that add mana of any color to cast Chromatic Dragon or to activate its activated abilities.
Flying, ward {1}, haste
{1}: Chromatic Dragon gets +1/+1 until end of turn.

Search your library for a nonland card not named Thin the Veil, exile it, then shuffle. If it has mana value less than or equal to the number of card types among cards in your graveyard, you may cast it without paying its mana cost. If you don't, put it into your hand.

First strike
Other creatures you control have protection from mana value 3 or greater.

When Ardent Ascetic enters, draw a card.
You may play an additional land on each of your turns.

Flying, haste
Whenever you cast a noncreature spell, put a +1/+1 counter on Sprite Dragon.