Looking at a mono-red deck like the one Ive made, there are some obvious benefits that immediately pop out
Notably, she can only reduce the colorless cost of those spells, so she will virtually never make spells entirely free
The player can unlock Jack as a Tag Partner by defeating him in three Tag and Tag Turbo Duels
Journey into Nyx Standard | Eric Rill Planeswalkers (7) 1 Jace, Memory Adept 2 Elspeth, Sun's Champion 4 Jace, Architect of Thought Spells (26) 1 Negate 1 Syncopate 2 Celestial Flare 4 Azorius Charm 4 Dissolve 4 Sphinx's Revelation 4 Supreme Verdict 1 Banishing Light 4 Detention Sphere 1 Elixir of Immortality Lands (27) 5 Island 5 Plains 1 Temple of Deceit 1 Temple of Silence 3 Mutavault 4 Azorius Guildgate 4 Hallowed Fountain 4 Temple of Enlightenment Sideboard (15) 2 Nyx-Fleece Ram 1 Deicide 2 Celestial Flare 1 Aetherling 1 Blind Obedience 1 Dispel 1 Negate 1 Pithing Needle 2 Gainsay 3 Last Breath While he definitely fits there, Nyx-Fleece Ram has potential in a main-deck slot
Crossovers have always been a contentious subject in the Magic community, and to an extent I understand the hesitation
If you're more into checking out some cards, we also have a set review for Kaladesh , the set just before this one
