As you might expect, having 90% of Standard players running Jace, the Mind Sculptor, 70% running Stoneforge, and perhaps 50% running both in Caw Blade did some crazy things to card prices
Creature lands like [c]Lair of the Hydra[/c] can tap for mana in the early game, then they can become creatures to attack and block during later turns
Emrakul, the Aeons Torn Emrakul, the Aeons Torn, the best Eldrazi card, is also pretty much the best creature ever printed to put into play with cards like Sneak Attack and Show and Tell
These sometimes appear with accompanying reminder text, but sometimes that explanation is cut to save space
This one is a rare example of the original text getting quicker to the point than the up-to-date ruling