Extort
, Sacrifice a non-Spirit creature: Return target creature card from your graveyard to your hand. It perpetually becomes a Spirit, has base power and toughness 1/1, and gains "You may pay rather than pay this spell's mana cost." Activate only as a sorcery.

As Ominous Lockbox enters, secretly choose a number between 1 and 20.
When an opponent casts a spell with mana value equal to the chosen number, sacrifice Ominous Lockbox. If you do, copy that spell, and you may choose new targets for the copy.
, Sacrifice Ominous Lockbox: Draw a card.

When Izzet Polarizer dies, conjure a card named Ionize or a card named Electrolyze into your hand. (Your choice is not revealed to other players.)

Disguise
Whenever Sleuth Instructor or another permanent you control is turned face up, seek a non-Elephant creature card with mana value 3 or less and cloak it. This ability triggers only once.

At the beginning of your upkeep, exile the top card of target opponent's library face down. You lose life equal to its mana value. You may look at and play that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.

When Construction Arsonist enters, you may choose an instant or sorcery card in your hand. If you do, that card perpetually incorporates and gains "When you cast this spell, it deals 2 damage to each opponent."
Whenever you cast a multicolored spell, Construction Arsonist gets +1/+1 until end of turn for each of that spell's colors.

When Guildpact Greenwalker enters, you may choose a creature card in your hand. If you do, that card perpetually incorporates and gets +4/+4.
Multicolored creatures you control have ward .

Draft a card from Relics of the Rubblebelt's spellbook twice, then put one of those cards onto the battlefield tapped.

Flying
When Cackling Observer enters, target opponent reveals each nonland card in their hand. You choose one of those cards and exile it.
When Cackling Observer leaves the battlefield, the exiled card's owner seeks a nonland card with lesser mana value than the exiled card.

At the beginning of each combat, Sproutwatch Dryad gains flying until end of turn if a creature you control or a card in your hand has flying. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.

Convoke
When Emmara, Voice of the Conclave enters, draft a card from Emmara, Voice of the Conclave's spellbook.

At the beginning of your end step, conjure a card named Slimy Dualleech onto the battlefield if you control no Leeches. Otherwise, put a +1/+1 counter on each Leech you control.
, Sacrifice a creature: Add an amount of equal to the sacrificed creature's power.

Flying
Whenever one or more creatures you control deal combat damage to a player, investigate.
, Sacrifice a Clue: Seek an instant or sorcery card.

As an additional cost to cast this spell, you may collect evidence 5.
Flying
When Spotlight Falcon enters, if evidence was collected, conjure a card named Spotlight Falcon into your hand.

Trample, ward , haste
Rampaging Ursaguana gets +2/+2 for each time this creature attacked this game.
Disguise