mtg radiance cards in MTG: Rules, History, and Best Whenever a creature you control with a +1/+1 counter on it dies Mtg Ravnica: City of Guilds

It becomes a 0/0 Elemental creature with haste

They went onto cards whose importance can change over time

Rare Utility Land Cycle These lands are fairly easy to include in 2- and 3-color decks without downside, and once you start activating their abilities, its value town

Im also a big fan of cards that push the game toward a conclusion, a theme lead designer Dan Emmons played up with the new commanders experience counter mechanic

Emrakul, the Aeons Torn First Printed: 2010-APR Banned: 2010-DEC Emrakuls collection of game-warping abilities come at a high cost, but they have a tendency to effectively win games without explicitly ending them

That said, Im not sure that sets like Iconic Masters or Masters 25 had the same impact