For non-reborns-burst, damn it.
for reborns-Training island. If you cannot afford these tickets I'd reccomend you get a team and afk at owls/relic island. Another good places for soloing(but needs much food sometimes) are the trees in same area with owls, trolls in Japan and the feedlot with leopards in Athens(after you enter the leopards area, discard the key the guard gave you and the leopards will attack like usual mobs.

Take the Magic: The Gathering 'What Color Are You?' Quiz.