13:11And I saw another beast coming up out of the earth; and he had two horns like a lamb, and he spoke as a dragon.

And I saw another BEAST

John is saying he has seen something like this before (verse 1) and it isn't any better the second time.

coming up out of the earth; and

This is the last of the satanic trilogy: Satan (devil himself), the sea beast (antichrist), and the earth beast (anti-Holy Spirit).

John the Baptist in discussing Christ makes an interesting statement about what "comes from the earth" (John 3:25-36).

he had two horns like a lamb, and

What an odd description because lambs don't have horns. Thus, this must be a representation of something like power and authority. Perhaps one horn is political and the other is religious.

Note the "other Lamb" in Revelation 5:6 has seven horns (complete authority over seven realms not fully known to mankind?).

Lambs were considered unblemished and spotless as fit for sacrifice (1 Peter 1:13-21). However, this one as a lamb ....

he spoke like a dragon.

Now the dragon, too, is fictitious. So what we have here is a wolf in sheep's clothing. Matthew 7:15-20 is how Jesus described him. Paul says "God will send" this beast to deceive "even the elect" (2 Thessalonians 2:1-11-12). These "elect" must refer to the sealed 144,000 Jewish men (next chapter) because the rest of the elect are gone in the "uptaking" by this time. The remaining people on this earth will accept the anti-Holy Ghost completely!