mtg keyword counter cards Ability/Keyword Counters for + Goad and Divinity by SnowPig MTG tokens include 5x First Strike Keyword counter - MTG Wiki

Every Commander 2014 precon featured a new mono-color planeswalker with the clause that they could be your commander

Ancestral Katana Banishing Slash Bushi Tenderfoot Bushi Tenderfoot Call to Glory Eiganjo Uprising Experimental Synthesizer Godo, Bandit Warlord Godo, Bandit Warlord Imperial Blademaster Imperial Oath Mothers Yamazaki (playtest) Naomi, Pillar of Order Oathkeeper, Takeno's Daisho Samurai's Katana The Eternal Wanderer The Wandering Emperor

Every fast mana card printed since then has been measured against it

People playing Standard, with all the new set releases and new fancy cards, and a big rotation every 2-3 years (see whats currently in Standard here)