Flagged for one mode having targets while an other doesn't.

Yeah. This seems more unfocussed than the other uncommon-11-slot cards that I've seen. This could be something like "Put a +1/+1 counter on target creature; target creature gains trample UEOT; target creature gains indestructible until end of turn." Eh... some redundancy, but it would be cheap otherwise.

Also in comparisson to Gravedigger this is cheap in one combination.

I think this card is about as focussed as the black card in the cycle and significantly more focussed than the blue card in the cycle. It is combining a lot of desirable and perpendicular effects that would be welcome in any midrange deck, in particular in a format where green has exploit. My only issue with this design is the fact that some modes target and some modes don't which can lead to counter intuitive gameplay.

Gravedigger has a lot of advantages over this card that justify the relative costs. First and most obvious is that a 2/2 is just worth much much much more than a 1/1. The second major advantage of gravedigger is that it is a creature, meaning you can loop them and just generally abuse gravedigger more easily than this card. The more relevant power level comparison is to Pulse of Murasa. This offers flexibility in the cost and a 1/1 in exchange for less life gained, reduced targeting options, and loss of instant speed.