({7} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) available each turn.
An additional ({3} magic symbol) or ({U} magic symbol) available each turn to activate Crystal Shard.
Steps
Cast Nexus of Fate by paying ({5} magic symbol) ({U} magic symbol) ({U} magic symbol) , granting you an extra turn after this one and exiling it due to rebound.
At the beginning of your next upkeep, rebound triggers, causing you to cast the exiled spell without paying its mana cost.
Activate Crystal Shard by tapping it and paying ({3} magic symbol) or ({U} magic symbol) , returning Venser to your hand.