Are there any cards that can boost my gate deck
There are various ways to copy lands, but no cards can change a land's type to "Gate"

Cards such as Vesuva and Thespian&#39;s Stage copy a land directly, which is the simplest way of doing it.

Other methods exist, but are hardly practical, such as turning a Gate land into a creature through cards like Animate Land, then copying that land creature with another card such as Clone.