So basically, I'm wondering here. Assume that the following things are true:
+My deck already has 50 cards
+ I am not cutting it down any further.
Now then, is it worth going above the 50 card minimum to add in cards that effectively replace themselves? For example, a lore deck with 50 cards: should it go up to 53 cards to add 3x Daeron's Runes, or stay at 50 cards?
Leadership is another sphere that has to make this choice a lot. A deck with Ld at 50 cards, should it go up to 52 to include 2x Valiant Sacrifice? If playing with 2 players, should it go up again to include 3x Campfire Tales?
I know the wisdom is to keep the deck small, but is card draw more important than having exactly 50 cards?