Cast Dragon's Approach by paying {2}{R}.
Spellweaver Helix triggers, causing you to cast a copy of Coveted Prize without paying its mana cost.
Resolve the copy of Coveted Prize, causing you to search your library for a Dragon's Apporach and put it into your hand, and then cast Dragon's Approach without paying its mana cost.
Repeat from step 2 until you have cast every Dragon's Approach in your library.
Resolve a Dragon's Approach, dealing 3 damage to each opponent, and allowing you to exile it and four other cards named Dragon's Approach from your graveyard to search your library for a Dragon creature card and put it onto the battlefield.
Repeat step 5 for each remaining Dragon's Approach.

Cast every Dragon's Approach in your library and hand without paying their mana costs

Near-infinite damage

Near-infinite magecraft triggers

Near-infinite storm count

Spellweaver Helix

Dragon's Approach

Coveted Prize

Cast Seasons Past by paying {4}{G}{G}, returning Walk the Aeons, Coveted Prize, and any number of cards with different mana costs to your hand and putting Seasons Past on the bottom of your library.
Cast Coveted Prize by paying {4}{B}, putting Seasons Past from your library into your hand.
Cast Walk the Aeons by paying {4}{U}{U}, granting you an extra turn.
Repeat each turn.

Infinite turns

Seasons Past

Walk the Aeons

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