(It can't be blocked except by two or more creatures.) If the target creature isn't both attacking and equipped when Item Shopkeep's ability tries to resolve, it won't resolve and none of its effects will happen
If something more value comes into your hand, they can always become ink
The way challenging works is a ready (untapped) character exerts and chooses an opposing exerted character to challenge, and then both cards compare their strength (attack) and willpower (defense) values to each other (meaning the attacker automatically gets hit back by the defender)
These boosters are more expensive and aimed at players who tap into the nostalgia like Innistrad Remastered collector boosters or want high-end Modern Horizons 2 collector boosters stuff
The God gets a legendary creature card that shows why Wastes were included in the set, while the sorcery called Ultima gives Magic players a board wipe with a twist
Until now, Party decks in Commander have lacked a great option to lead them