Lots of creatures have reminder text these days
Its like an extremely powerful Planeswalker ability, except it happens every turn from now on, and cant be attacked or destroyed by most conventional means
Ghoulcaller Gisa leads The black deck 'Wretched Ranks'
The fact that every bit of damage heals its controller causes games to swing wildly from one direction to another
Playing a card stores its seal in your "arcana gauge." In the example below, the astrologian draws The Ewer, which has the moon seal, then plays it, storing a moon seal in their arcana gauge
However, if you were to return a cheap one mana creature to your hand, the value is excellent , especially if you can still recast that creature again in the same turn.