Smaug, Wicked Worm

A 5/5 flier is acceptable, but its Treasure payout is opponent-dependent and tapped. It is a plausible fringe finisher if artifact-heavy boards are common.

Could be wrong if Artifact counts or a viable Rakdos shell may be too low for the delayed mana and draw trigger to matter.

Five mana is a major liability against Pioneer interaction and faster engines. Smaug is mainly a narrow test card against artifact- or Vehicle-heavy opponents.

Could be wrong if A successful Rakdos shell or artifact-heavy metagame could make its ETB Treasure burst more reliable.

It is too slow and conditional for most Modern decks; even against artifact decks, tapped Treasures do not create an immediate turn-five swing.

Could be wrong if A cheat-into-play shell or sustained artifact-heavy metagame could make the ETB substantially stronger.

Legacy's five-mana creatures need immediate, exceptional impact. Smaug depends on opposing artifacts, delays its mana, and is vulnerable as a legend.

Could be wrong if Fast mana plus a concentrated artifact matchup could support a niche sideboard or combo role.

Three opponents commonly supply several artifacts, making the ETB a large delayed mana burst; surviving to spend Treasures converts subsequent spells into cards.

Could be wrong if Low opposing artifact counts or immediate removal after the ETB can leave it as an expensive flier without its card-draw engine.

A five-mana 5/5 flier is already premium; any opposing artifact adds delayed mana and can turn a later Treasure-funded spell into a card.

Could be wrong if Set speed, removal, and actual artifact density are unknown; frequent zero-artifact boards reduce it to a merely strong flier.