Tractor Beam and untapping with Nanoform Sentinel
I cast tractor beam targeting Brightspear zealot. I know that the zealot cannot be summoning sick because on the previous turn, it had just attacked me. Then, using Gene Pollinator on Nanoform Sentinel, I used the trigger to untap the Brightspear Zealot. I should now be able to attack with it, but the game does not let me.
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Rezzahan#77802
commented
It IS summoning sick. Becasue YOU did not contiously control it since your most recent turn (trhis turn) began. It does not matter how many turns it has been on the batlefield, your contious control of it determines summoning sickness. Andf yes, that measn, creature can become summoning sick again, for example by changing controllers. Hence why red "steal for a turn" cards grant haste.