Ob Nixilis, the Fallen [The List] Nightmare Sphinx Bird creatures get +1/+1 for

Bird creatures get +1/+1 for each feather counter on Soulcatchers' Aerie

And if there's a route worth taking

each planeswalker you control becomes a 4/4 red Dragon creature and gains flying

Set: Signature Spellbook: Jace Type: Instant Rarity: Rare Cost: {U} Draw three cards

Set: Commander Legends Type: Artifact Rarity: Uncommon Cost: {1} {T}: Add {C}{C}

Ob Nixilis, the Fallen [The List] Nightmare Sphinx Bird creatures get +1/+1 forSet: The List Type: Legendary Creature Demon Rarity: Mythic Cost: {3}{B}{B} Landfall Whenever a land enters the battlefield under your control, you may have target player lose 3 life. If you do, put three +1 +1 counters on Ob Nixilis, the Fallen. His spark lost, he plots revenge upon the plane whose corrupting mana fractured his soul.