Mana Matrix [Legends]Set: Legends Type: Artifact Rarity: Rare Cost: {6} Instant and enchantment spells you cast cost up to {2} less to cast.

(It's an aura with "When you play an attack action card or attack with a weapon

Set: Dominaria Prerelease Promos Type: Legendary Planeswalker — Karn Rarity: Mythic Cost: {4} +1: Reveal the top two cards of your library

Set: XY: Flashfire Type: Dragon Rarity: Secret Rare Retreat cost: Colorless

Then that permanent's controller may sacrifice a land

Set: Arena League 1996 Type: Basic Land — Plains Rarity: Rare ({T}: Add {W}

Set: Revised Edition Type: Land — Swamp Forest Rarity: Rare ({T}: Add {B} or {G}

Set: Welcome to Rathe Edition: Alpha Print Finish: Rainbow Foil Type: Action Subtype: Aura Rarity: Super Rare Class: Guardian Cost: 1 Go again While Forged for War is in the arena

you may add an amount of {C} equal to the number of creatures you control that share a creature type with it

Set: Modern Masters 2017 Type: Land Rarity: Rare {T}

"This is what glory looks like

They sapped the strength of our defenses

Set: Beta Edition Type: Sorcery Rarity: Uncommon Cost: {3}{G} Destroy all Islands