Knowledge Exploitation (38) [Morningtide] Conflux Artifacts you control have "{T}:

Artifacts you control have "{T}: Add one mana of any color

Set: Summer Magic / Edgar Type: Creature — Human Barbarian Rarity: uncommon Cost: {2}{R}{R} Keldon Warlord's power and toughness are each equal to the number of non-Wall creatures you control

whenever a player casts an instant or sorcery spell

then discard four cards

Set: Modern Horizons 2 Promos Type: Creature — Dauthi Rogue Rarity: rare Cost: {B}{B} Shadow (This creature can block or be blocked by only creatures with shadow

Knowledge Exploitation (38) [Morningtide] Conflux Artifacts you control have "{T}:Set: Morningtide Type: Kindred Sorcery Rogue Rarity: rare Cost: {5}{U}{U} Prowl {3}{U} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.) Search target opponent's library for an instant or sorcery card. You may cast that card without paying its mana cost. Then that player shuffles.