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The others are both low impact but scale very nicely

When your opponent activates an effect in response to the activation of your Synchro monster's effect: Negate your opponent's effect

It's not quite Fact or Fiction but it's a sweet second copy

SE Secret Rare Infinitrack Anchor Drill X EARTH Level 4 [ MachineEffect ] ATK 1800 DEF 500 If this card is Normal or Special Summoned: You can Special Summon 1 EARTH Machine monster from your hand in Defense Position, except "Infinitrack Anchor Drill"

This card could be used as a way to negate an opposing monster's effect or as a finisher if you target your monster

One of the best parts of Ludevic, Necro-Alchemists ability is that it doesnt specify combat damage, so spellslinger commanders, burn decks, or life drain decks have just as much chance of getting extra cards with this partner in play as more combat-heavy builds