Did you just convergently design Crystalline Nautilus or was your card inspired by it?

Forge of Creativity

Enchantment (R)
Whenever you cast an instant or sorcery spell with converted mana cost less than your devotion to red, copy that spell. You may choose new targets for the copy.

Whoops, I knew it was too good an idea not to have been snapped up.

Treesong
Enchantment - Aura
Enchant creature or land
Enchanted permanent is a land with ": Add ." (It loses all other types.)
"The forest gave each verse with a saunter of limbs and a wisp of leaves,
and the crowd joined with unrivaled beauty."
—Myth of Jelora's orchard

Hubris of the Weaver
Enchantment — Saga
I - Each player may put up to one enchantment card from their hand or graveyard onto the battlefield.
II - Destroy target enchantment an opponent controls.
III - Exile target creature. Its controller creates a 1/2 green Spider creature token with reach.

Ship of Kynaios

Legendary Artifact -- Vehicle (R)
Whenever Ship of Kynaios deals combat damage to a player, exile it and each creature that tapped to crew it this turn, then return them to the battlefield tapped under your control.
Crew 2
5/5

Dryad-Blessed Copse
Enchantment Land — Forest (R)
(: Add .)
Bestow
Dryad-Blessed Copse enters the battlefield tapped if it’s a land.
Enchanted creature has “: Add .”

Tarkir

Wandering Arbiter
Creature — Human Monk
Prowess
Whenever an opponent casts a noncreature spell, you draw a card and Wandering Arbiter gets +1/+1 until end of turn.
The Jeskai do not rule their territory and leave the trading posts and villages along their lakes and roads alone. Still, the common folk seek the wisdom of the traveling monks and elders.
1/1

Dismissive Stroke

Instant (U)
Counter target spell. If you are in harmony, draw a card. (You are in harmony if the number of cards in your hand and the number of creatures you control are equal.)
"Achieving balance is easy. Maintaining it is the challenge." —Chanyi, Ojutai monk

That's kind of a dumb mechanic now that I think about it more, but it's too late. I already clicked "Submit" and now you've already looked at it.

Dawn Chaser
Creature — Human Warrior
When Dawn Chaser enters the battlefield, exile the top card on your library. You may play that card as long as Dawn Chaser remains on the battlefield.
Dash
2/2

Soulwinder —
Creature — Snake (R)
When Soulwinder dies, shuffle it into your library, then manifest the top three cards.
4/4

Untapped Resources
Enchantment (R)
When Untapped Resources enters the battlefield, mill five cards.
Spells you cast have delve.
"What terrors lie beneath/
great power or great grief?"
—Cantos of Woe, canto 62

Pearl Beads
Artifact — Equipment
Flash
Equipped creature gets +1/+1 and has prowess.
Equip

Kaladesh

Aetherflow Engineer
Creature — Dwarf Artificer
Fabricate 1, fabricate 1
When Aetherflow Engineer enters the battlefield, each player draws a number of cards equal to the number of +1/+1 counters on Aetherflow Engineer.
"Our design is to ensure equal access to all. Complaints come only from greed and ego."
1/1

Consulate Academician

Creature - Vedalken Artificer
Authority - , sacrifice an artifact: Counter target spell unless its controller pays for each artifact you control. Activate this ability only if no permanents you controlled have left the battlefield this turn.
"If you can't defend your thesis, you don't deserve to have it."
1/3

Engorged Parasite —
Creature — Leech (R)
As an additional cost to pay Engorged Parasite, pay .
When Engorged Parasite dies, you get and you add .
Adolescents delight in squashing them, feeling the blood, mana, and aether tingle as it drips through their fists.
2/2

Aether Glutton
Creature — Gremlin
Aether Glutton has haste if its power is 3 or greater.
When Aether Glutton enters the battlefield, choose one—

• All players lose all and put that many +1/+1 counters on Aether Glutton.
• Each player sacrifices an artifact and put a +1/+1 counter on Aether Glutton for each artifact sacrificed this way.

1/1

Springcoil Hydra

Artifact Creature -- Hydra (M)
Springcoil Hydra enters the battlefield with X +1/+1 counters on it.
When Springcoil Hydra enters the battlefield, gain X .
, Pay : Put a +1/+1 counter on Springcoil Hydra.
0/0