He allows you to cast artifact spells from your hand or graveyard by paying life instead of mana
The trick with the "yes, plus" group of effects is that you want the additive part to feel cohesive to the effect
If you cast a spell with demonstrate and both you and an opponent copy it, the opponent's copy will resolve first, then your copy will resolve, and finally the original spell will resolve
Spoiler Main Deck: | Artifact Moralltach || Artifact Scythe ||| Artifact Failnaught || Artifact Vajra || Artifact Lancea || Artifact Caduceus | Artifact Achilleshield ||| Artifact Beagalltach | Artifact Aegis | Thunder King Rai-Oh || Aroma Jar ||| Dark Sanctuary ||| Card of Demise ||| Pot of Duality || Mystical Space Typhoon ||| Artifact Ignition ||| Artifact Sanctum ||| Call of the Haunted Extra Deck: || Gaia Dragon, the Thunder Charger || Constellar Ptolemy M7 | Number 21: Frozen Lady Justice | Wind-Up Arsenal Zenmaioh | Adreus, Keeper of Armageddon || Constellar Pleaides || Number 61: Volcasaurus || Artifact Durendal | Shark Fortress | Outer Entity Azaroth Conclusion: As always, the list above is just my personal build
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