Rodolf, Loyal Froststeed

Trample
When Rodolf, Loyal Froststeed enters the battlefield, you may search your library for a
creature card with converted mana cost of {4} or less and put it on the battlefield. If you do, shuffle Rodolf, Loyal Froststeed into your
library.
{1}{s}{s}: Creatures you control gain trample until
end of turn.