msem-instigator

When a creature you control scavenges Wanderer of Many, create a token that's a copy of that creature. Put a +1/+1 counter on the copy.
Scavenge {3}{U} ({3}{U}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Flying
Whenever Wandering Dragonfly or another creature you control enters, you may draw a card. If you do, discard a card.

When Wandering Visionary enters, draw a card.
{W}{U}{B}{R}{G}: Create a 1/1 blue Elemental creature token with flying.

Augmented — When you cast Want It All, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, copy Want It All for each other spell cast this turn.
Shuffle your library. Then exile the top card of your library. You may play it without paying its mana cost.

When Ward-Lost Hermit enters, mill three cards.
{2}, {T}, Sacrifice Ward-Lost Hermit: Return target instant or sorcery card from your graveyard to your hand.

Defender
When Warden of Silence enters, draw a card.

When Warden of the Archives enters, if you cast it, tap up to four target permanents.

You may have Warped Physiognomist enter as a copy of any creature on the battlefield with mana value 3 or less.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

When Warping Relic enters or is put into a graveyard from the battlefield, choose one —
• Draw two cards, then discard a card.
• Return another target nonland permanent to its owner's hand.
• Choose any number of target creatures. Switch their power and toughness until end of turn.

Invigorate 1, then untap each creature you control with a +1/+1 counter on it. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)

When Warrior's Perspective enters, invigorate 1. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)
Whenever a creature you control with a +1/+1 counter on it becomes tapped, you may draw a card. If you do, discard a card.

Enchant creature
Enchanted creature is a blue Frog with base power and toughness 1/1 and loses all other card types, creature types and abilities.

Hexproof
When Wary Watchkeeper enters, target player mills three cards.

Counter target activated or triggered ability.
Metamorph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Put target nonland permanent on top of its owner's library.

Target player mills two cards.
Draw a card.
Coalesce {6}{U} (You may cast this from your graveyard for {6}{U}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Changeling (This card is every creature type.)
Watcher of the Polyps has all names of creature cards in addition to its name as long as it's on the battlefield.
Watcher of the Polyps gets +X/+X, where X is the greatest number of creatures you control with the same name.

Each other creature you control that's a Merfolk or an Elemental gets +1/+1.
Whenever you cast an instant, sorcery, or Merfolk spell, you may pay {1}. If you do, create a 1/0 blue Elemental creature token.

Counter target spell unless its controller pays {2}. If there are three or more counters among permanents you control, counter that spell instead.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
{3}{U}: Target creature gains slipstream until end of turn.

Target player mills four cards.
Dominance — That player mills eight cards instead if you control the creature with the greatest power or tied for the greatest power.

Create two Idol tokens, then counter target spell unless its controller pays {1} for each Idol you control. (They're artifacts with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)