"way too good", in a meta where we have Judgement Dragons, Brave Neos, Desperados, Quinted Magicians, Invokers, Shiranuis, Blackwings etc etc. Once uppon a time Duel Links was a balanced game with balanced cards. As time goes by the power creeping becomes ridiculus. Soon enough i am pretty sure it will end like the boring TCG, full of overpowered cards.
The effect only activates every time your opponent goes into Battle Phase, and does not activate on the turns where your opponent does not go into Battle Phase.
Actually the key word is control.
It says Return CONTROL Of all monsters.
So if your opponent controls your monster you can take it back and vice versa. So use Lava golem, destroy two of your opponents monsters and then take Lava Golem ba
By early DM standard this isn't lame, especially back in Duelist Kingdom arc where Level 5+ monsters can be summoned without tribute.
From Battle City onward though....yeah, this is lame.
Flip Summon is also flipping face-up, so you cannot activate its effect on the turn it is Flip Summoned.
Even without the restriction, it's not like you can activate its effect on the same turn it is Flip Summoned, anyway, since you usually Flip Summon during Main Phase, which happens AFTER Standby Phase, meaning this card is still face-down during Standby Phase.
Considering the lack of timestamp on that post, I believe that guy posted from years ago, back when Primal Burst (the 9th main box) is still rather new.