Whenever a land enters the battlefield under your control, investigate. (Create a colorless Clue artifact token with ", Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, put a +1/+1 counter on Tireless Tracker.

Target player sacrifices a creature or planeswalker.
Delirium — If there are four or more card types among cards in your graveyard, instead that player sacrifices a creature and a planeswalker.

When Tooth Collector enters the battlefield, target creature an opponent controls gets -1/-1 until end of turn.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, target creature that player controls gets -1/-1 until end of turn.

Flying
When Topplegeist enters the battlefield, tap target creature an opponent controls.
Delirium — At the beginning of each opponent's upkeep, if there are four or more card types among cards in your graveyard, tap target creature that player controls.

As an additional cost to cast this spell, discard a card.
Draw two cards.

, Tap an untapped creature you control: Transform Town Gossipmonger.

Whenever you cast an instant or sorcery spell, investigate. (Create a colorless Clue artifact token with ", Sacrifice this artifact: Draw a card.")

Search your library for a basic land card, reveal it, put it into your hand, then shuffle your library.
Delirium — If there are four or more card types among cards in your graveyard, instead search your library for a creature or land card, reveal it, put it into your hand, then shuffle your library.

At the beginning of your upkeep, choose one —
• Each player with exactly 13 life loses the game, then each player gains 1 life.
• Each player with exactly 13 life loses the game, then each player loses 1 life.

Equipped creature gets +1/+1 and has vigilance.
As long as equipped creature is a Human, it gets an additional +1/+0.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Trample
: Target attacking Wolf or Werewolf gains indestructible until end of turn.

Reach
Ulvenwald Hydra's power and toughness are each equal to the number of lands you control.
When Ulvenwald Hydra enters the battlefield, you may search your library for a land card, put it onto the battlefield tapped, then shuffle your library.

Whenever a nontoken creature you control dies, investigate. (Create a colorless Clue artifact token with ", Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token.

Target creature gets +1/+1 and gains double strike until end of turn. (It deals both first-strike and regular combat damage.)

Unimpeded Trespasser can't be blocked.

Skulk (This creature can't be blocked by creatures with greater power.)
When Uninvited Geist deals combat damage to a player, transform it.

Whenever another creature you control dies, put a +1/+1 counter on Unruly Mob.

, Sacrifice Vessel of Ephemera: Create two 1/1 white Spirit creature tokens with flying.