msem-instigator

{T}, Tap an untapped creature you control: Choose one —
• Add one mana of any color.
• Target player loses 2 life.
• Target player gains 3 life.
• Target player mills four cards.

You may have Darksteel Mirror enter as a copy of any permanent on the battlefield, except it has indestructible in addition to its other abilities.

You have hexproof.
Whenever you cast a noncreature spell, you may tap or untap target permanent.

{T}: Add {C} and one mana of any color.

As Enlightened Sigil enters, choose a card type.
Spells you cast of the chosen type cost {1} less to cast.

If you would search your library for one or more cards, you may search for an additional card. (It still follows the same restrictions and effects.)

At the beginning of each end step, if a creature died this turn, you may put a +1/+1 counter on target creature you control.

{T}: Add one mana of any color.
{7}, {T}, Sacrifice Hero's Statue: Draw three cards.

When Horn of Seasons enters, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Equipped creature gets +3/+0.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)

{T}, Discard a card: Draw a card.
{1}, {T}, Discard a card: Scry 2, then draw a card.
{4}, {T}, Discard a card: Search your library for a card, put it into your hand, then shuffle.

When Masterwork Archivist enters, search your library and/or command zone for a legendary card, reveal it, then put it into your hand or graveyard. If you searched your library this way, shuffle.
When Masterwork Archivist dies, you may draw a card.

If you would choose one or more modes, you may choose an additional mode. (Modal spells and abilities are indicated by • listed modes.)
{1}, {T}: Add one mana of any color.
{6}, {T}: Add {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}.

This spell costs {1} less to cast for each artifact and/or enchantment you control.
Trample
{1}, Sacrifice another cryptic permanent you control or exile a cryptic card from your graveyard: Put a +1/+1 counter on Observer of Aeons. (Artifacts, enchantments, and modal spells are cryptic.)

You may cast spells as though they had flash.

{3}: Create a 9/9 colorless Angel artifact creature token with flying and lifelink.

Once each turn, when another permanent you control enters, you may create a token that's a copy of that permanent, except it has no mana cost.

Equipped creature gets +1/+1.
At the beginning of combat on your turn, choose flying, first strike, vigilance, trample, or haste. Equipped creature gains that ability until end of turn.
Equip {2}

Whenever you attack, you may draw a card. If you do, discard a card.

{T}: Add one mana of any color.
{X}: Terracotta Idol becomes a Spirit artifact creature with base power and toughness X/X until end of turn. Activate only as a sorcery.

{T}: Add one mana of any color in your commander's color identity.

You may play Promethean Grotto from your graveyard.
{T}: Add {C}.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {C}.
{2}, {T}: Target creature gains haste until end of turn.

{T}: Add {C}.
{3}, {T}: Aetherize target permanent you control. Activate only as a sorcery. (To aetherize, create a token that's a copy of it, then exile that token.)

{T}: Add {C}.
{3}, {T}, Sacrifice Treasure Beach: Create three Treasure tokens. (They have “{T}, Sacrifice this artifact: Add one mana of any color.”)

As Harlowe, Thespian Extraordinaire enters, choose a color and creature type.
Harlowe, Thespian Extraordinaire is the chosen color.
Harlowe, Thespian Extraordinaire is the chosen type in addition to its other types.