Depends on what deck style you like most and on your budget.
Corruption Mages utilize and as key cards and Nehant Guemelite mages in order to maximize . Since Legion is pretty expensive, for budget deck you can consider as damaging spell. Some of more useful spells are , , , , etc.
Hand-deny Marauders go for denying draw and returning enemy's hand to their deck. Characters are , and or . Key cards are Cutting All Ties, Illumination (it is important that 3x Cutting are ONLY spells in deck), , , which turns into nuke combined with .
Demon Warriors rely on ability to negate damage from items and is great filled with items like , , , , and other cursed items. Has decent direct damage with , and .
Debuff-Servant Warriors are pretty cheap deck which goes with , and 3rd character, maybe Ardrakar for her defense boost. Ripper gets stronger as Servants enter game, and deck can heavily cripple enemies with use of , , , , , etc. Cards like or which depend on number of Servants are good addition.
Hope this hels ^_^
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