Orvar, the Copy, Steal and Combo All-Form (actual proxy deck) (EDH / Commander)

There are many Routes to Victory in this high-powered Combo deck.

Route 1:
Copy Orvar with spells like Spark Double - copy Orvar - use buy back spellst to make infinte islands or Orvars
draw your deck with draw engine creatures like wavebreak hippocamp, that draw a card when you cast your buy-back spell

Route 2:
Copy Cloudpost with buy-back spells and make a huge amount of islands.You can use High Tide to go infinite with Whim of Volrath or Clockspinning.

Route 3:
Copy Coveted Jewel with a buy-back spell and draw your whole deck and then cast Dramatic Reversal. or copy gilded Lotus infinitely

Route 4:
Copy Peregrine Drake with a buy-back spell and make infinte mana and infinte peregrine drakes.

Route 5 (when Orvar is not awaylable):
Tutor out Willbreaker and sway of Illusion to steal the whole board

How the Tutors work:

Spellseeker is a key card in this deck, as it can find the buy-back spells, but also it can find Transmute Artifact to find Coveted Jewel, when you already have a buy-back spell. It can find Irenicus's Vile Duplication via Mystical Tutor to copy Orvar.
It finds high tide, a counterspell, and also Cyclonic Rift
To tutor first for Essence Flux and flickering/copying spellseeker allows you to look for two spells.

Spellseeker can be tutored out in turn by Step Through and Vedalken Aethermage.

Step through and Vedalken Aethermage, can also be used to tutor out other wizards like Sower of Temptation and Willbreaker in case you want to steal the opponents' creatures

Mystical tutor can find all instance or sorcery Spells.

Also Dizzy spell can be transmuted and can also work as a tutor.

cuts and changes
leap -> aquitect's will/shimmering mirage (copying lands can be better)
shadow rift -> gigadrowse (you don't draw a card but can copy artifacts, lands and enchantments and also it can be a fog)