4 Haste Haste is the ability to tap and attack the very same turn a creature gets into play
On the other hand, if youre more focused on getting competitive with a smaller budget, you might get a better deal buying one of the newer releases
Ancient Stirrings is heading that way as well
The activated ability is a single ability that creates two one-shot effects: one that exiles the permanent when the ability resolves, and another that returns the exiled card to the battlefield immediately after In the Trenches leaves the battlefield
When it enters the battlefield, all creatures get +X/+X, where X is the number of creatures you control, including itself, as well as trample
You probably want to cheat it out, but itll be problematic if you can find the right engine