Becoming a 4/4 for four mana is more than fair, particularly when said 4/4 can also munch key cards in your opponents graveyard each time it swings in
Time Walk Five mana for Time Warp is a lot, but Time Walk lets you take an extra turn for a mere 2 mana
Sakura-Tribe Elder Alright, Magic: The Gathering class of 2004, get ready to welcome our new transfer student
However, that is not the case
It being four mana is crucial for allowing the deck to function, but its also the sweet spot on the curve where people tend to fire off removal
I haven't dissected each card yet, but on the first look these 3 are what I see becoming a staple or a fun commander to build a deck with: As most of you also noticed, Dryad of the Ilysian Grove is a possible staple for decks with green