Final character idea?
Using only uncoloured cards (neutral) 24 cards in base.
Character is robotic, does not make errors, is supreme. Main aim is to outlast the opponents cards.
Skill could be when you have ten cards in hand you gain health for each card discarded.
New card 1 is a construct tower that resurrects all fallen friendlies at end of turn. Has 1 power 4 health. Looks like an angel statue.
New card 2 converts cards into health. Spell or troop unsure. Perhaps choose the amount of cards to send to grave equals health. Or discard a card, its cost equals health.