The 5/5 flying and deathtouch stat line is impressive enough for just 5 mana, but his second ability screams ''combo.'' Not only does this go infinite with the likes of Sanguine Bond in Commander, it also can instantly win you games in Limited
Sephiroth gives you the latter two out of the command zone, being a Blood Artist that can also cash your creatures in for cards
Having more counters on more controlled creatures allows Tidus to more readily proc his " Cheer " ability, allowing him to Proliferate and draw, though this can only occur once per turn
The second type of restrictions, however, are far more straightforward: Game Changers, a new list of cards curated by Wizards
For my example commander, lets start with Food synergies
Only having a brief stint in Modern before a swift ban, Hogaak, Arisen Akropolis showed the power and value that come with a card that does not require lands to cast