First printed in Bloomburrow (2024)
All 5 prints
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Secret Lair Promo (SLP) #48, 2026
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Bloomburrow (BLB) #133, 2024
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Bloomburrow (BLB) #315, 2024
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Bloomburrow Promos (PBLB) #133p, 2024
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Bloomburrow Promos (PBLB) #133s, 2024
Emberheart Challenger 

Creature — Mouse Warrior
Haste
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, exile the top card of your library. Until end of turn, you may play that card.
In the last 30 days 1.1% of Standard decks played it (1 of 95). Most played in UBR (unclassified). In the last 30 days 44.4% of Pioneer decks played it (4 of 9). Most played in Mono-Red Aggro.
Staple
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Pioneer staples:
main deck, 44% of decks (#2)
Red, Creatures
Last 120 days of MTGO results.
Legality
Constructed
- Standard Legal
- Pioneer Legal
- Modern Legal
- Legacy Legal
- Vintage Legal
- Pauper Not legal
- Future Standard Legal
- Historic Legal
- Timeless Legal
- Alchemy Legal
- Penny Dreadful Not legal
- Premodern Not legal
- Old School 93/94 Not legal
Singleton
- Gladiator Legal
Commander formats
- Commander Legal
- Duel Commander Legal
- Pauper Commander Not legal
- PreDH Not legal
- Tiny Leaders Legal
- Oathbreaker Legal
- Brawl Legal
- Standard Brawl Legal
- Competitive Brawl Legal