Core Set 2021 set symbol
Identify Core Set 2021 by the unique set mark shown here (M21). Older frames may place related marks differently, but the information line still carries the modern set code when present.
Set code
m21
Released
Jul 2020
Cards
397
Type
Core
Lookalikes & traps
White-border vs black-border eras matter for older cores; do not price a M21 reprint as the earliest expansion printing of Core Set / Terror. Also watch foil vs nonfoil: sheen does not change which set Core Set 2021 is.
Confirm after the icon
Bottom information line should show collector number + set code M21 (and usually a C/U/R/M rarity letter). On Core Set / Terror, mismatch between listing title and M21 is the usual bait-and-switch.
How to identify Core Set 2021 cards
- 1
Locate the Core Set 2021 set mark (M21) before you trust the card name — reprints reuse names across products.
- 2
Use symbol color for draft rarity on M21, then treat showcase/borderless as a separate finish check.
- 3
Verify M21 on the bottom line; listings that only show the card name are where Core Set 2021 get mixed with siblings.
- 4
If icon and M21 still disagree with a marketplace title, scan with Tappr rather than guessing from art.
Rarity by symbol color
Modern rarity colors on the Core Set 2021 symbol: black common (white only in rare one-set exceptions like Dominaria), silver uncommon, gold rare, orange/red-orange mythic. Foil, showcase, and borderless treatments keep the same rarity color — they change finish/frame, not the C/U/R/M letter.
Legend shows the modern post-Exodus palette. Pre-Exodus sets and special rarities (for example Time Spiral purple timeshifted) follow the rarity reading above — not this swatch row alone.
FAQ
What does the Core Set 2021 set symbol look like?
Identify Core Set 2021 by the unique set mark shown here (M21). Older frames may place related marks differently, but the information line still carries the modern set code when present. Reprints of Core Set / Terror under other codes keep different glyphs — match the icon, then M21.
What is the Core Set 2021 set code?
The set code is M21. It appears with the collector number on modern cards. If you see a different code, you are not holding the Core Set 2021 printing even when the name matches.
How do I read rarity on a Core Set 2021 card?
Modern rarity colors on the Core Set 2021 symbol: black common (white only in rare one-set exceptions like Dominaria), silver uncommon, gold rare, orange/red-orange mythic. Foil, showcase, and borderless treatments keep the same rarity color — they change finish/frame, not the C/U/R/M letter.
How do I confirm a Core Set 2021 card quickly?
Icon match → rarity reading for this era → M21 + collector number. White-border vs black-border eras matter for older cores; do not price a M21 reprint as the earliest expansion printing of Core Set / Terror.. Tappr can finish the printing match when the listing is ambiguous.
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