msem-instigator

Look at the top three cards of your library, then put them into your graveyard or back on top of your library in any order.
Draw two cards.

As an additional cost to cast this spell, exile a creature card from your graveyard.
Create a tapped 2/3 black Mummy creature token.

Destroy target planeswalker. Mummy's Grin deals 2 damage to that planeswalker's controller.

Create two 1/1 white Soldier creature tokens. Prevent all damage that would be dealt to them this turn.

Whenever a creature you control dies, destroy target creature you don't control.

As Mysterious Cataract enters, you may pay 2 life. If you don't, Mysterious Cataract enters tapped.
{T}, Sacrifice Mysterious Cataract: Search your library for a Forest or Island card, put it onto the battlefield, then shuffle.

Whenever you cast a spell from exile, you may draw a card.
At the beginning of your upkeep, you may reveal the top card of your library.

When Mystic Seer enters, each player may scry 1.
{2}{U}: Draw a card, then discard a card.

Each player mills three cards. For each instant and/or sorcery card milled this way, draw a card.

[+1]: Reveal the top card of your library and put that card into your hand. You lose life equal to its mana value.
[0]: You gain 1 life for each card in your hand.
[–7]: Search your library for up to X cards, where X is the number of cards in your hand, and put them into your hand. Then shuffle.

You draw X cards and you lose X life, where X is the number of cards in your graveyard.

When Naiad of the Glen enters, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Naiad of the Glen has trample as long as it has a +1/+1 counter on it.

Trial 2 (As you cast this spell, an opponent of your choice may pay 2 life. If they don't, they fail the trial.)
When Nascent Adversary enters, if the trial was failed, it gains haste and first strike until end of turn.

Destroy target artifact or enchantment.
Scry 1.

{G}, Exile a creature card from your graveyard: Put two +1/+1 counters on target creature.

Destroy target artifact or enchantment.

Defender (This creature can't attack.)
When Naturebound Druid enters, you may search your library for a basic land card, reveal it, then shuffle and put that card on top.

Target creature gains deathtouch until end of turn. Regenerate it.

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, you may exile it. If you do, return target creature card from your graveyard to the battlefield.

Equipped creature has all activated abilities of all creature cards in your graveyard.
Equip {3}

Counter target noncreature spell.

As an additional cost to cast this spell, tap an untapped artifact you control.
Target player discards two cards.

Counter target instant or sorcery spell unless its controller pays {3}.

Flying (This creature can't be blocked except by creatures with flying or reach.)
{R}: Newborn Dragon gets +1/+0 until end of turn.