Son Goku, Earth's Spirit

{1}: Tap target creature you control, put a Spirit
Bomb counter on Son Goku, Earth's Spirit.
At the beginning of your end step, you may
remove all Spirit Bomb counters from Son Goku,
Earth's Spirit. If you do, deal damage equal to the
amount of counters removed to target creature,
Plainswalker or player.
"Please everyone, lend me your energy!"