Few cards in Magic offer a multiplicative effect like Cathar's Crusade
Revitalizing Repast/ Old-Growth Grove Chances are you'll be able to play Old-Growth Grove before you'll want to play the instant side, sometimes it's the correct play
The pngs at Scryfall (MIC, VOC) aren't quite sufficient for me, though someone with any actual artistic talent whatsoever might be able to deal with them
Don't get fooled by nay-sayers: while using this with Leyline Binding sure sounds fun and efficient, it's not the peak of this card's synergies
Still, out of an abundance of caution, let's say that the Ultimate Box Topper adds about $40 to the value of an Ultimate Masters booster box, to be safe
The upper end is very strong and hard to play around, though not quite as strong as one particularly furious elemental well get to shortly