Chakram Retriever

Untapping a creature every time you cast a spell on your turn reads like a control rider, but the axis it actually rewards is repeated activation. A 2/4 body that re-readies a target each spellcast turns any tapper, mana dork, or convoke-style attacker into a machine that scales with how many cheap spells you can chain in a turn rather than with the power of any single one. Point the trigger at a creature with a useful tap cost, keep the curve low, and each spell buys another untap and another use of that ability: more mana, more pings, more blockers freed to attack again next combat. It does not grant extra combat steps or fresh attacks in the same turn; what it multiplies is tap-based abilities, not the combat phase itself. The partner text is the structural wrinkle. These fixed two-card teams tutor each other into hand, and this half is designed to pair with Chakram Slinger, so a two-headed deck assembles its own spells-matter shell once either creature resolves. The part worth building around is the untap engine; the partner clause mostly guarantees you draw toward the package. As a lone effect it looks modest, and it is: the design rewards density of cheap spells over individually powerful ones, a quieter optimization than most five-mana blue creatures ask for, and one that only pays off once every other slot is tuned to feed the trigger.