I didn’t think it was possible but Javasci wrote up an entire article about changing bad cards out for mo betta ones. I swear I can squeeze more blood from this rock!
“Card Insertions are always accompanied by removal of the same number of cards as you insert,”
…
“In a deletion, it is one card not being good enough and being taken out. You then need to fill the hole. In an insertion, it is one card being necessary for the deck, and needing to make space for that card.”
…
“When you tap a land for mana, you get mana!”
Ok, I made that last one up, but I think I’ve made my point.
[...] who I’ve talked about before produced another “duh” article over at puremtgo. Titled “A New Player´s Guide to [...]