You may look at the top card of your library any time. You may cast creature spells from the top of your library. You can spend mana of any type to cast creature spells.

When Volo enters, create Volo's Journal, a legendary colorless artifact token with hexproof and "Whenever you cast a creature spell, note one of its creature types that hasn't been noted for Volo's Journal." {2}, {T}: Draw a card for each creature type noted for target permanent you control named Volo's Journal. Choose a Background

Defender When this creature enters, draw a card.

Trample When this creature enters, you gain 3 life. When this creature dies, create a 4/4 green Rhino Warrior creature token. Blitz {4}{G}{G} (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.)

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) When this creature enters, you may search your library for a Forest card, put it onto the battlefield tapped under target player's control, then shuffle.