Instruction
Deck field can have main deck cards each starting with new line in the format of:2 The Ozolith
2 Swarm Shambler
2 Inscription of Abundance
or it can have the whole decklist, maindeck and sideboard should be separated by blank line, for example:
2 The Ozolith
2 Swarm Shambler
2 Inscription of Abundance
2 Runed Halo
3 Destiny Spinner
also you can add new deck using mtgarena format, if you do so, you have to use only maindeck field and the format should be:
Deck
4 Conclave Mentor
12 Forest
2 The Ozolith
2 Swarm Shambler
2 Inscription of Abundance
3 Gilded Goose
3 Gnarlid Colony
2 Scavenging Ooze
3 Oran-Rief Ooze
2 Banishing Light
2 Wildwood Scourge
1 Branchloft Pathway
3 Basri's Lieutenant
1 Basri Ket
2 Gemrazer
3 Luminarch Aspirant
2 Temple of Plenty
9 Plains
2 Gingerbrute
Sideboard
3 Shatter the Sky
2 Runed Halo
3 Destiny Spinner
1 Sorcerous Spyglass
2 Heroic Intervention
2 Gingerbrute
2 Banishing Light
4 Conclave Mentor
12 Forest
2 The Ozolith
2 Swarm Shambler
2 Inscription of Abundance
3 Gilded Goose
3 Gnarlid Colony
2 Scavenging Ooze
3 Oran-Rief Ooze
2 Banishing Light
2 Wildwood Scourge
1 Branchloft Pathway
3 Basri's Lieutenant
1 Basri Ket
2 Gemrazer
3 Luminarch Aspirant
2 Temple of Plenty
9 Plains
2 Gingerbrute
Sideboard
3 Shatter the Sky
2 Runed Halo
3 Destiny Spinner
1 Sorcerous Spyglass
2 Heroic Intervention
2 Gingerbrute
2 Banishing Light