This is valid, but its also valid to wait to pay for the spell until the final step of casting a spell: 605.3a A player may activate an activated mana ability whenever they have priority, whenever they are casting a spell or activating an ability that requires a mana payment, or whenever a rule or effect asks for a mana payment, even if its in the middle of casting or resolving a spell or activating or resolving an ability
Arm-Mounted Anchor Bandit's Talent Behold the Unspeakable Carnage Interpreter Davriel, Rogue Shadowmage Djeru and Hazoret Dread Wanderer Hazoret the Fervent Jace, the Perfected Mind Naktamun Lorespinner Neheb, the Worthy Phyrexian Portal Quantum Riddler Shelldock Isle Shrieking Affliction Temple of the Dead Thresher Lizard
But since that usually costs you one ink, he's probably better compared to Lilo - Galactic Hero with one less lore
Squirrel Wrangler Squirrel lovers will go nuts for this one
(6/13/2017) If two or more effects require a creature to attack different players or planeswalkers, such as that of this scheme and that of Gideon Jura's first ability, that creature's controller chooses one to fulfill
