First printed in The Dark (1994)
Artifact
Spells you cast cost 
less to cast.
The Pretender Mairsil ordered a great Calendar drawn up to show when the paths to the Dark Lands were strongest.
- Illustrated by
- Amy Weber
Legality
- Legal in
- Legacy, Vintage, Commander, Duel Commander, PreDH, Oathbreaker
- Not legal in
- Standard, Pioneer, Modern, Pauper, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Gladiator, Pauper Commander, Tiny Leaders, Brawl, Standard Brawl, Competitive Brawl
Rulings (2)
- Does not change the mana cost of the spell, it just reduces what you pay for it.
- You may choose not to apply Stone Calendar’s cost reduction effect.
Prices
MTGO price: 0.009 TIX, the cheapest non-foil print (average sell price on GoatBots, 30 Oct 2026).
Combos
197 combos, the most popular first:
- Infinite card draw, Infinite draw triggers…: Mystic Forge + Sensei's Divining Top + Stone Calendar
- Infinite card draw, Infinite draw triggers…: Echoes of Eternity + Sensei's Divining Top + Stone Calendar
- Infinite artifact ETB, Infinite artifact LTB…: Krark-Clan Ironworks + Myr Retriever + Scrap Trawler + Stone Calendar
- Infinite card draw, Infinite draw triggers…: Sensei's Divining Top + Stone Calendar + The Reality Chip
- Infinite card draw, Near-infinite storm count…: Crystal Skull, Isu Spyglass + Sensei's Divining Top + Stone Calendar
- Infinite artifact ETB, Infinite artifact LTB…: Ashnod's Altar + Myr Retriever + Scrap Trawler + Stone Calendar
- Near-infinite storm count, Near-infinite self-discard triggers…: Birgi, God of Storytelling // Harnfel, Horn of Bounty + Sensei's Divining Top + Stone Calendar
- Infinite card draw, Infinite draw triggers…: Future Sight + Sensei's Divining Top + Stone Calendar
- Near-infinite artifact ETB, Near-infinite artifact LTB…: Krark-Clan Ironworks + Sculpting Steel + Spine of Ish Sah + Stone Calendar
- Infinite card draw, Infinite draw triggers…: One with the Multiverse + Sensei's Divining Top + Stone Calendar