msem-instigator

Whenever a land you control enters, add one mana of any color.
Whenever Enraged Fangwurm attacks, you may sacrifice a land. If you do, Enraged Fangwurm deals 2 damage to target player or planeswalker.

Griffin Country enters with a feather counter on it.
Creatures with flying you control get +1/+1.
{U}, Remove a feather counter from Griffin Country: Put a flying counter on target creature you control.
{2}{U}, Remove a feather counter from Griffin Country: Search your library for a creature card with flying, reveal it, put it into your hand, then shuffle.

Tap target creature. It doesn't untap during its controllers next untap step.
Judge target creature you control. (Honor it by putting a +1/+1 counter on it or condemn it by sacrificing it to draw a card.)

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{5}: Unlock Key to the Nexus. If {W}{U}{B}{R}{G} was spent to activate this ability, you may cast the revealed card without paying its mana cost. Otherwise, put that card on top of your library.

Equipped creature gets +2/+1 and has flying.
Equip {3}

When Gateway Statues enters, put a +1/+1 counter on target creature you control.
{T}: Add one mana of any color.

Draw X cards and you gain X life, where X is the number of card types among permanents you control.

Hexproof
When Overburdened Trader enters, create three 1/1 colorless Construct artifact creature tokens.

Exile any number of target cards in exile. (They become new objects that have just been exiled.)
Draw a card.

{T}: Add {U} or {B}.
{T}, Sacrifice Sigil of Malice: Add {U}{B}.

Prevent all combat damage that would be dealt to creatures this turn. Creatures that attacked you this turn don't untap during their controller's next untap step.

Whenever an artifact is put into your graveyard from the battlefield, you may draw a card. If you do, discard a card.
{T}, Exile three noncreature cards from your graveyard: Create a 1/1 colorless Construct artifact creature token.

This spell costs {2} less to cast if your starting deck contained at least forty cards more than the minimum deck size.
When Unrivaled Fireweaver enters, you may exile a red instant or sorcery card you own from outside the game. Until the end of your next turn, you may play that card.

Target attacking creature gets +3/+0 until end of turn.

Target creature gets +3/+0 and gains lifelink and indestructible until end of turn.

Enchant creature
When Ravage of Moments enters and at the beginning of your upkeep, put a -1/-1 counter on enchanted creature.

Flash
You may cast cryptic spells as though they had flash. (Artifacts, enchantments, and modal spells are cryptic.)

Reach
{1}: Untap Leapweb Lurker.

You may have Flawless Counterfeit enter as a copy of any noncreature artifact on the battlefield.

Target creature gets +3/+2 and gains menace until end of turn.
Quickdraw {1}{R} (When a creature you control blocks or becomes blocked, you may cast this spell for {1}{R}.)

Flying, first strike
When Swiftclaw Griffin enters, return a creature you control to its owner's hand.

Enchant creature
You may cast this spell from your graveyard if it targets a legendary creature you control.
Enchanted creature gets +2/+2 and has trample.

Foretell {B} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Up to one target creature gets -1/-1 until end of turn. Put a +1/+1 counter on up to one target creature.

Ruins Monitor can't be blocked by more than one creature.