Most played cards in Rebels:

1 Decks
Swords to Plowshares
4 copies - 4 average
Adarkar Wastes
4 copies - 4 average
Blue Elemental Blast
4 copies - 4 average
Standstill
4 copies - 4 average
Mana Leak
4 copies - 4 average
Ramosian Sergeant
4 copies - 4 average
Lin Sivvi, Defiant Hero
3 copies - 3 average
Defiant Falcon
3 copies - 3 average
Disenchant
3 copies - 3 average
Shared Triumph
3 copies - 3 average
Circle of Protection: Red
2 copies - 2 average
Hibernation
2 copies - 2 average
Propaganda
2 copies - 2 average
Thalakos Lowlands
2 copies - 2 average
Flooded Strand
2 copies - 2 average
Absorb
2 copies - 2 average
Whipcorder
2 copies - 2 average
Counterspell
2 copies - 2 average
Shelter
1 copies - 1 average
Ramosian Sky Marshal
1 copies - 1 average