Curiosity

Enchant creature
Whenever enchanted creature deals damage to an opponent, you may draw a card.

Merchant Scroll

Search your library for a blue instant card, reveal that card, put it into your hand, then shuffle.

Whenever a creature dies, that creature's controller may draw a card.

Enchant permanent
You control enchanted permanent.

Return target green card from your graveyard to your hand.

Islands don't untap during their controllers' untap steps.

Creatures don't untap during their controllers' untap steps.
Whenever a creature enters, untap all creatures.

Enchant artifact
You control enchanted artifact.

{G}, {T}: You may put a creature card from your hand onto the battlefield.

{U}{U}{U}, {T}: Return target permanent to its owner's hand.

Return all creatures to their owners' hands.

Put two target lands on top of their owners' libraries.

Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)

Creatures with power greater than the number of cards in your hand can't attack.