Island

Panharmonicon

If an artifact or creature entering causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Changeling (This card is every creature type.)
Changeling Outcast can't block and can't be blocked.

Target player shuffles their graveyard into their library.
Draw a card.

Glasspool Shore enters tapped.
{T}: Add {U}.

You may have Glasspool Mimic enter as a copy of a creature you control, except it's a Shapeshifter Rogue in addition to its other types.

Drowned Catacomb enters tapped unless you control an Island or a Swamp.
{T}: Add {U} or {B}.

Return target creature to its owner's hand. Its controller draws a card.

{T}, Pay 1 life, Sacrifice Polluted Delta: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

You may have Jwari Shapeshifter enter as a copy of any Ally creature on the battlefield.

Return target creature to its owner's hand.
Addendum — If you cast this spell during your main phase, draw a card.

Rally — Whenever Kalastria Healer or another Ally you control enters, each opponent loses 1 life and you gain 1 life.

({T}: Add {U} or {B}.)
As Watery Grave enters, you may pay 2 life. If you don't, it enters tapped.