Stormsplitter and Phyrexian Altar on the battlefield.
({6} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) at most, depending on how many Stormsplitters you control available.
Steps
Csat Mystic Speculation with buyback by paying ({2} magic symbol) ({U} magic symbol) .
Each Stormsplitter you control triggers, creating that many token copies of Stormsplitter.
Resolve Mystic Speculation, causing you to scry 3 and return it to your hand.
If you control at least 6 Stormsplitters, activate Phyrexian Altar three times by sacrificing three Stormsplitter tokens, adding ({2} magic symbol) ({U} magic symbol) .