As Aquamorph Entity enters the battlefield or is turned face up, it becomes your choice of 5/1 or 1/5.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Whenever you cast a Spirit or Arcane spell, put a +1/+1 counter on target creature.

When Cackling Fiend enters the battlefield, each opponent discards a card.

, , Discard a card: Target creature gets +X/+0 until end of turn.

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)
As an additional cost to cast creature spells, you may pay any amount of mana. If you do, that creature enters the battlefield with that many additional +1/+1 counters on it.

: Look at the top X cards of your library, where X is the number of cards in your hand, then put them back in any order.

When Dream Stalker enters the battlefield, return a permanent you control to its owner's hand.

Enchant permanent
When Faith's Fetters enters the battlefield, you gain 4 life.
Enchanted permanent can't attack or block, and its activated abilities can't be activated unless they're mana abilities.

Counter target red or green spell.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)
Target creature gets +2/+2 until end of turn.

Enchant creature
Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it. can be paid with one mana from a snow permanent.)
Enchanted creature gets +3/+3 for each age counter on Glacial Plating.

At the beginning of your draw step, draw an additional card.
At the beginning of your end step, discard your hand.

Whenever a player casts a spell, they may pay . If the player does, they draw a card at the beginning of the next end step.

Imprint — When Isochron Scepter enters the battlefield, you may exile an instant card with converted mana cost 2 or less from your hand.
, : You may copy the exiled card. If you do, you may cast the copy without paying its mana cost.

, : Untap target creature.

Counter target spell if no mana was spent to cast it.

Return all artifact and enchantment cards from all graveyards to the battlefield under their owners' control. (Auras with nothing to enchant remain in graveyards.)

When Priest of Gix enters the battlefield, add .

When Riftsweeper enters the battlefield, choose target face-up exiled card. Its owner shuffles it into their library.

Trample
Whenever Rimehorn Aurochs attacks, it gets +1/+0 until end of turn for each other attacking Aurochs.
: Target creature blocks target creature this turn if able. ( can be paid with one mana from a snow permanent.)