The pull rate structure mirrors Mega Brave (2 SR+ guaranteed, SAR ~1/6 boxes, MUR ~1/50 boxes), but the lower market price means your EV ratio is among the best available
PlayIkoria Three Ikoria: Lair of Behemoths packs
One player ran the numbers and suggested completing the entire expansion without paying anything would take something between approximately 500 and 1100 days of consecutive play on average, depending on what in-game rewards and mechanics you factor into the equation
What is more common is that cards like Negate, Spell Pierce, Flusterstorm, Dispel and Glen Elandra Archmage abilities are held up to prevent countermagic and this bypasses such things and will force through your creature
Each of those creatures gets +1/+1 until end of turn for each creature chosen before it
39 copies were officially awarded to the winners, while two copies were later rediscovered in 2020 by one of the card games co-creators, Yuichi Konno, bringing the total number of Pikachu Illustrator copies in existence to 41