We felt an upkeep effect would create them at the right rate but also be impressive enough for a rare
As if a Standard shake-up wasnt exciting enough, Edge of Eternities Limited is also looking incredibly promising
Players who are more casual and may be struggling to keep up can usually just play all of their spells main phase, but the player trying to stay ahead will want to keep mana up for countermagic and removal and if you can force them to either stop playing spells on their own turn or on other players' turns, you can really cramp their style
The upside is interesting here, and in many EDH games, you should be able to mill 25+ cards with Space-Time Anomaly alone
Crew vehicles, block little early creatures, or throw it in front of larger creatures later in the game are all great options for this little guy
In a Two-Headed Giant game, Sanctum of Stone Fangs causes the opposing team to lose twice X life and you to gain X life