I like it, I say go with keepsake. Or whatchamacallit. Either one.

Doodad, it gives the name some nice alliteration.

Oracle of Ending
Legendary Artifact [M]
~ enters the battlefield tapped.
: sacrifice ~, you win the game.
Mastery: : sacrifice ~, you win the game. Activate this ability only if you control a land, artifact, enchantment, and creature.
To everything there is an ending, even the eternal dawn and the very darkness itself.

Mastery seems too easy to achieve in this format to use it for something as crazy as turning on a mox. Maybe if you needed double mastery, or exactly one of each or something.

Incantation Engine
Artifact
Reveal an instant or sorcery card from your hand and pay that card's mana cost: Exile the revealed card.
: Cast a spell exiled with Spell Vessel without paying its mana cost. Put that card into your graveyard.
Far to the south, an order of men and women work in secret, harnessing the vast energies needeed to right their broken world.

Does this seem mythic, or just rare? It might have to return the spell to your hand or something to be a mythic.

You know what? You're right. I've got a new idea:

Needs to enter tapped and tap to activate, at minimum. Will be banned in EDH (see coalition victory). I think Helix Pinnacle is the example for infinite mana game-winners. You just tore off every safety value on Door to nothingness and added a quick release. Door to nothingness is already good.

Alright, I'll add the minimum.

Door to nothingness is my favorite card but it has awful, and whoever bans coalition victory in Edh doesn't like fun. The problem I have with your card FA is that it's super clunky.

I really do not know how to streamline it any further.

For each card type, search your library for a card of that type and put it into your hand. (Then,) shuffle your library (afterwards).
Means it can hit Tribal as well, but I don't see that as a negative.

My only suggestions would probably change your card foo much, unless you want to get rid of the twobrids. Any more than 5 of them in a row just looks weird.

Planar Gyroscope
Legendary Artifact
T: Untap each other permanent with a ability. Tap each permanent not untapped this way, those permanent s don't untal during their controller's next untap step.
No one knows where it is. No one knows what it does. Every denizen of Starstill knows what it did.

I meant 7, the number for Op things nobody plays.

There are many things with that card that isn't immediately obvious.

Makes a pretty good Vorinclex impression every other turn though.

Seems super easy to get to infinite combo on T4 or sooner.

T1 Forest, Elvish Mystic
T2 Forest, Razortip Whip, Voltaic Key
T3 Forest, Planar Gyroscope
T4 Win


It's in the Intruder Alarm class of incredibly-easy-to-break combo enablers.

Well, you do give your opponent infinite mana in the process, at the very least.

Fine I'll cost it 6, babies

so much OP in this round.

Scars of Mirrodin block had Metalcraft to turn on a Mox Opal. His original submission is more difficult to turn on even if it is slightly. If he made it legendary, it would be fine

Marakas' Thermometer --
Artifact (MR)

: You may sacrifice a permanent. If you do, search your library for a permanent card that shares a type with it and put it onto the battlefield tapped.

==xx==

This needs a different name, It originally did something else.

Nemesis Engine
Artifact - Equipment

When ~ enters the battlefield, choose a card type.
~ and the equipped creature have protection from the chosen card type.
Equipped creature gets +4/+4
Equip