Cumulative upkeep
When this enchantment enters, look at the top ten cards of your library, then exile any number of them and put the rest back on top of your library in any order.
When this enchantment leaves the battlefield, shuffle your library.

Enchant creature
Enchanted creature gets +2/+2 for each other enchantment on the battlefield.

Look at the top seven cards of your library. Put two of them into your hand and the rest into your graveyard.

Target player draws three cards.

Draw three cards, then discard a card.

When this creature enters, return a nonland permanent you control to its owner's hand.

You gain 2 life for each card in your graveyard.
Flashback

Enchant creature
When this Aura enters, put a +1/+1 counter on target creature you control.
Enchanted creature gets -1/-1.

Suspend 4 —
Target player draws three cards.

As an additional cost to cast this spell, sacrifice an artifact or creature.
Search your library for an Equipment or Vehicle card, put that card onto the battlefield, then shuffle. If it has mana value less than the sacrificed permanent's mana value, scry 2.

Put target creature on top of its owner's library. Scry 1.

When this artifact enters, destroy target creature.
, , Sacrifice this artifact: You gain 3 life.

Vigilance, ward
Damage isn't removed from this creature during cleanup steps.
All damage that would be dealt to you and other permanents you control is dealt to this creature instead.
When this creature dies, exile it and create ten tapped Treasure tokens.

As this land enters, you may reveal a Giant card from your hand. If you don't, this land enters tapped.
: Add or .

Put a +1/+1 counter on target creature you control if it's legendary. Then it fights target creature an opponent controls. (Each deals damage equal to its power to the other.)

Flying
Whenever this creature deals combat damage to a player, roll a d20. When you do, put any number of target creature cards with total mana value X or less from graveyards onto the battlefield under your control, where X is the result.

Gargantuan dragon, Challenge 20
Armor class 20, Hit Points 297
Speed 40 ft., burrow 40 ft., fly 80 ft.
Attacks Bite, Claw, Tail, Frightful Presence, Fire Breath, Sleep Breath, Change Shape
STR 27 (+8) DEX 10 (+0) CON 25 (+7)
INT 16 (+3) WIS 15 (+2) CHA 19 (+4)

Flying
Whenever this creature deals combat damage to a player, roll a d20. When you do, put X +1/+1 counters on each of up to two target creatures, where X is the result.

Gargantuan dragon, Challenge 22
Armor class 22, Hit Points 444
Speed 40 ft., fly 80 ft., swim 40 ft.
Attacks Bite, Claw, Tail, Frightful Presence, Lightning Breath, Repulsion Breath, Change Shape
STR 29 (+9) DEX 10 (+0) CON 27 (+8)
INT 18 (+4) WIS 17 (+3) CHA 21 (+5)

Each spell you cast that's a Demon, Horror, or Nightmare costs less to cast.
Whenever you cast a spell, if the amount of mana spent to cast it was less than its mana value, target opponent loses life equal to the difference.

Flying
Whenever this creature deals combat damage to a player, roll a d20. You create a number of Treasure tokens equal to the result.

Gargantuan dragon, Challenge 21
Armor class 21, Hit Points 350
Speed 40 ft., climb 40 ft., fly 80 ft.
Attacks Bite, Claw, Tail, Frightful Presence, Acid Breath, Slowing Breath, Change Shape
STR 27 (+8) DEX 12 (+1) CON 25 (+7)
INT 20 (+5) WIS 17 (+3) CHA 19 (+4)

Whenever you cast a spell that's one or more colors, you may gain 1 life for each of that spell's colors. Do this only once each turn.
: Add one mana of any color.