Teferi, Time Raveler is the same way, as his passive power prevents players from casting instant-speed spells the moment he touches the table, preventing counterplay at a very early turn: as early as turn two if you can get some quick one-cost mana ramp out turn one
Aroma Jar even gives you 500 life points at the end of each turn
If this card is in your GY, and you have successfully activated "Millennium Ankh" this Duel, and your opponent Normal or Special Summons a monster(s) that is Level 8 or higher, or has 3000 or more ATK: You can send that monster to the GY, and if you do, Special Summon this card
Ive spoken highly about it thus far, but I havent quite put it all into perspective yet
I would have ranked it higher, but being legendary (and not a creature, so dying a lot less often) really limits just how much we can exploit it
Lessons For some, the limited themes were too on rails