Since you control the spell that Spellshift countered, you can reveal cards from your library until you cast another Instant or Sorcery for free
That's because there are plenty of cards that give Defenders the ability to attack, and to deal damage with their toughness, rather than their power
What is happening instead is that WotC holos are really dark, especially compared to their Japanese counterparts
P/T Number 525 Language English Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) If Cecil, Dark Knight is dealt lethal damage at the same time it deals damage (probably because it blocked or became blocked), its last ability will still trigger
Its almost like WotC wanted the blink kitty to create infinite loops, and the only check on such an absurd ability was an underwhelming statline