mtg whenever a card is exiled Magic: The Gathering's Most Resilient Cards Don't Even Stay Whenever Assimilation Aegis becomes attached to a creature Let the Galaxy Burn (40K)

Freerunning is a new alternative cost that allows you to cast spells for a bit of a savings if earlier in the turn an Assassin you controlled or a commander you controlled dealt combat damage to a player

Marcy: Myriad is indeed a really interesting mechanic because it fits only in Commander, and frankly, it's one of the more interesting Commander only mechanics that isn't political

Use the calendar seasons as they apply to your location

It's also amazing in Type Four, where an alternate cost like cleave is free, so you can get a free counter when you cleave that doesn't count as your spell for the turn

Pathbreaker Ibex This six-mana 3/3 is my highest scoring that might not always kill dork, here with an attack trigger to pump your stuff by your highest power and then trample too