Let's be honest: this card is never going to be
in a deck that doesn't have at least four
different card types. That makes it effectively
a 6/6 for four mana on its first attack step,
with the threat of even more growth to follow.
That is the sort of card that ends games in very
short order, although the timing of the +1/+1
counter additions means that your opponent has
quite a bit of time to make a gameplan and to
react accordingly. That may keep it out of the
top tiers for tournament Magic, but those stats
and the amount of support in older sets for all
parts of its design mean that it will certainly
find a niche, and do so well.
a 3/3 trample for 4 is boring. a late game 3/3
trample for 4 that doubles in strength a turn
after casting and only gets stronger from there
is attention grabbing. If anything, it's a
distraction from other stuff you're planning. Is
that all it's good for? no, but it's something.
Not the biggest or the best, but it's something
worth considering, at least for fun.