Sylvan Rejuvenation

Sorcery (U)

Draw X cards. X is the number of lands and creatures you control minus the number of artifacts, enchantments, planeswalkers and battles you control.

I know you said no X spells, but I think this card is Spiritually not an 'X-spell' even though it literally has X in it's text box. I assumed by 'X-spell' you meant something with X in it's casting cost.

Challenge: Repeat

OR

Take a rare card you like and downgrade it to a common/uncommon.

Nibbla, Queen of the Dammed

Legendary Creature - Beaver Druid

Whenever a Forest enters under your control, create a 1/4 green artifact Dam Elemental creature token with defender.

Whenever an Island enters under your control, create a 3/1 blue River Elemental creature token with hexproof.

At the beginning of each upkeep, if you control an elemental, you may put a land card from your hand onto the battlefield.

2/4

Make a Vedalkin Warrior

Advanced Corporealization

Instant - Lesson

Reveal the top 8 cards of your library. You may put an artifact card or enchantment card from among the revealed cards onto the battlefield under your control. Put the rest of the revealed cards on the bottom of your library in a random order.

"Concentrate on the Amulet... Visualize the Amulet... Now make it appear."

I don't think 'Corporealization' is a real word, but it should be.

Challenge: Make a sea monster with power 3 or less.

Golaris, Soul Shepherd

Legendary Creature - Undead Sorcerer

Skulk, Deathtouch

Whenever a creature attacks, if it's attacking a player other than you, you may give that creature your choice of Deathtouch, Flying, Lifelink or Skulk until end of turn. If that creature would die this turn, exile it instead and both you and that creature's controller draws a card.

2/2

Make a big bug.