If you can Weld this back in after a thirst for knowledge without any suspend needed then this is absolutely broken as a 4-of.
Gilded Lotus is infinitely better with TfK + Welder, and that card is not playable in Slaver.
Some games I had 2-3 of these in my opening hand and by turn three I had 2-3 black
Actually suspend only allows you to have them by turn 4 at the earliest. Which means, if you're on the play, you have to survive at least 3 of your opponents turns with what is essentially a forced mulligan, and on the draw, make that 4 turns. Granted, Gilded Lotus wouldn't be any better than Lotus Bloom for playing earlier, but its interaction with TfK is infinitely stronger. In any case, that's neither here nor there - neither card provides the
quick acceleration needed in the early turns, and neither card has a game ending effect when welded or tinkered.
timewalk makes it 3 turns.