Klawf, The Stony Cliff Titan

Klawf, The Stony Cliff Titan can't be blocked.
Suspend 9—{2}{u} (Rather than cast this card from
your hand, you may pay {2}{u} and exile it with nine
time counters on it. At the beginning of your upkeep,
remove a time counter. When the last is removed, you
may cast it without paying its mana cost. It has haste.)
Whenever an opponent casts a spell, if Klawf,
The Stony Cliff Titan is suspended, remove
a time counter from it.