Forum:Wicked Rebirth and Synchro Change

What is the difference between the two? Why is it that both negate the ability of the synchro monster, however when stardust tributes itself while affect by wicked rebirth it's effect still activates, while the same situation with Synchro change...it's effect does not activate? It's the same case with Decending Lost Star Aznskills90214 23:25, June 11, 2010 (UTC)