Once in play, Tasigur's activated ability for four mana allows its controller to mill two cards, then return a nonland card of an opponents choice from their graveyard to their hand
Riot means You may have this permanent enter with an additional +1/+1 counter on it
It blows up a land for every copy, and with just a decent storm count, it leaves the entire table scrambling for mana
The Game Changers list has a similar function, though: These cards are powerful enough to completely turn a game around, so most brackets restrict how many cards can be included from the list
And, needless to say, the Reaper King brings down the house as a Halloween commander, if you ever need one
One thing Ill mention is not to overlook playing your commander with only one or two creatures if you know you can play more and flicker it again