Invasion of Ixalan // Belligerent Regisaur

Set name - March of the Machine
(As a Siege enters, choose an opponent to protect it. You and others can attack it. When it's defeated, exile it, then cast it transformed.)
When this Siege enters, look at the top five cards of your library. You may reveal a permanent card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Trample
Whenever you cast a spell, this creature gains indestructible until end of turn.

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"Careful. Its vision is based on fear, and it can smell movement . . . or something like that."
—Gregor, amateur zoologist