Ob Nixilis, the Adversary (Borderless) [Streets of New Capenna]

Ob Nixilis, the Adversary (Borderless) [Streets of New Capenna]Set: Streets of New Capenna Type: Legendary Planeswalker Nixilis Rarity: Mythic Cost: {1}{B}{R} Casualty X. The copy isn't legendary and has starting loyalty X. (As you cast this spell, you may sacrifice a creature with power X. When you do, copy this spell. The copy becomes a token.) +1: Each opponent loses 2 life unless they discard a card. If you control a Demon or Devil, you gain 2 life. 2: Create a 1 1 red Devil creature token with "When this

I serve the bonds between us

Set: Revised Edition Type: Instant Rarity: Common Cost: {1}{B} Destroy target nonartifact

Set: Time Spiral Remastered Type: Sorcery Rarity: Common Cost: {5}{B} Target player discards three cards

Seat of the Empire: It deals 4 damage to target attacking or blocking creature

Set: Sun & Moon: Burning Shadows Type: Darkness Rarity: Ultra Rare Retreat cost: Colorless

Set: Black & White: Base Set Type: Grass Rarity: Promo Retreat cost: Colorless

there is an additional combat phase after the first

you may return target land to its owner's hand

Set: Weatherlight Type: Creature — Efreet Rarity: Common Cost: {2}{G}{G} Cumulative upkeep {G} (At the beginning of your upkeep

Set: Ultimate Masters Type: Creature — Human Soldier Rarity: Common Cost: {3}{W}{W} Flying

Set: Duel Decks Anthology Type: Creature — Goblin Rarity: Common Cost: {R} Sacrifice a Goblin: Target creature gets +1/+1 until end of turn

Now show me its tactical applications