Throat Wolf - Symbol (CMB1) from Mystery Booster Playtest Cards 2019, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Sam Stoddard
• Card Text:
  You may cast CARDNAME during an opponent’s combat phase.
  Firstest strike (This creature deals combat damage to creatures before creatures with first strike.)
  After each opponent’s first combat phase of each turn, there is an additional combat phase. Only CARDNAME can attack during that combat phase.