The classic example is probably Young Pyromancer, all looking to make an Elemental token each time you cast that instant or sorcery
I fundamentally believe that demand needs to come from players, Plmason confirmed
If you have delirium, its 4 mana to draw three, while the going rate for 4-mana instants tends to be two cards, as with Glimmer of Genius, Hieroglyphic Illumination, and so on
Amulet Titan in Modern got a few new toys, as the deck tends to do each set release
For this reason, we gave Phlage the nod over Kroxa in our best MTG Giants rankings
Given current pricing, which is collapsing by the minute, there are still a few overpriced cards that should be exited in a hurry, if you have the chance: Zendikar Fetchlands : These are going to lose another 20-30% of their value as rares