This feels like it would work -in theory- in a perfect setting, but if you're a RDM and you're in a party where people keep dying (including the healer), a handful of Verraise feels like it could shut down a Red Mage entirely.
[Edit]: I shouldn't say, 'entirely,' since the melee combos will work fine without Mana of either type. However, the effective DPS will be severely handicapped, with no way of restoring it without begging a BLM/SMN for a Mana Shift.