If you look in the bottom left corner of the card, SPE cards will not be Standard, but SPD cards will
Since this is pretty clear to see, its no wonder that many MTG players have been steadily picking up copies of Ifnir since the deck was announced
As a brief mathematical aside (feel free to check my work, Quandrix nerds), here is a short comparison of non-generic/staple overlaps with the appropriate predecessor across each Secrets of Strixhaven Commander deck, not counting Sol Ring or Arcane Signet nor generic/staple lands: 7 cards from Silverquill Influence overlap with Silverquill Statement 10 cards in Witherbloom Pestilence to Witherbloom Witchcraft 10 cards in Prismari Artistry to Prismari Performance 5 cards in Lorehold Spirit to Lorehold Legacies 9 cards in Quandrix Unlimited to Quantum Quandrix Seeing the data laid out as such, it's hard to justify my vibes-based analysis as anything more than a poorly calibrated vibes antenna
Attacking creatures do one extra direct damage to the player or planeswalker theyre attacking
They provide extra advantages, like healing Pokmon or letting you discard your hand and draw new cards
It only applies to physical, tournament-legal cards