You can track inventory, wishlists, and trade lists
I have no discussed a number of those more exotic options as it would lead to talking about the support cards that might go with those and ultimately lead to double the cards needing mention
Similarly, Lightning Bolt and Swords to Plowshares represent the peak of efficiency for their effects, remaining staples for decades because no other cards do their job better for the cost
For as long as it remains exiled, it has "You may cast this card from exile as long as you've cast another spell this turn." The second spell you cast each turn costs less to cast
One of the easiest ways to get value out of him is to play cards that mill yourself, plus ReanimateReanimate-like effects to recur the juiciest creature you flip over
Brotherhoods End is a wrath that just keeps earning its keep for me in every game I play it