If the spell that's copied has an X whose value was determined as it was cast, the copy will have the same value of X
Remember when I said I didnt like spellslinger
But because it counts only the recently dead, this has its limits

MAX SPEED Creature (31) 1x Artificer's Assistant 1x Bronze Guardian 1x Cybermen Squadron 1x Digsite Engineer 1x Etherium Sculptor 1x Faerie Seer 1x Foundry Inspector 1x Gingerbrute 1x Gold-Forged Thopteryx 1x Guidelight Synergist 1x Hope of Ghirapur 1x Ironsoul Enforcer 1x Judge's Familiar 1x Kappa Cannoneer 1x Losheel, Clockwork Scholar 1x Master of Etherium 1x Mockingbird 1x Myr Battlesphere 1x Nesting Bot 1x Network Disruptor 1x Oltec Matterweaver 1x Padeem, Consul of Innovation 1x Pride of the Road 1x Silver Raven 1x Solemn Simulacrum 1x Steel Overseer 1x Stridehangar Automaton 1x Swooping Lookout 1x Thought Monitor 1x Vnwxt, Verbose Host 1x Voyager Quickwelder Artifact (20) 1x Adaptive Omnitool 1x Arcane Signet 1x Assimilation Aegis 1x Azorius Signet 1x Bident of Thassa 1x Commander's Sphere 1x Hulldrifter 1x Idol of Oblivion 1x Lightning Greaves 1x Perilous Snare 1x Racers' Scoreboard 1x Rover Blades 1x Salvation Engine 1x Sculpting Steel 1x Shorikai, Genesis Engine 1x Sol Ring 1x Starting Column 1x The Indomitable 1x Twinning Staff 1x Valor's Flagship Instant (5) Sorcery (4) Enchantment (3) Commander (1) Land (36) 1x Amonkhet Raceway 1x Ancient Den 1x Azorius Chancery 1x Command Tower 1x Deserted Beach 1x Exotic Orchard 1x Flooded Strand 1x Glacial Fortress 9x Island 1x Lonely Arroyo 1x Muraganda Raceway 1x Mystic Gate 10x Plains 1x Port Town 1x Prairie Stream 1x Razortide Bridge 1x Seat of the Synod 1x Skycloud Expanse 1x Temple of Enlightenment Suggestions Updates Add Comments Attention
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When you cast Bloodline Culling you can have a creature get -5/-5 until end of turn, which can be useful for killing off any specific threat, but especially those that are indestructible, as they dont die through normal means
2017-08-25 If you somehow control a Herald's Horn with no chosen creature type, no spells will cost less to cast, not even creature spells with no creature type