Blue & Green Merfolk (Ravnica Allegiance Standard)

{1}{G}, {T}: This turn, each creature you control enters with an additional +1/+1 counter on it.

{1}{U}, {T}: Move a +1/+1 counter from target creature you control onto another target creature you control.

Target creature you control explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on the creature, then put the card back or put it into your graveyard.)

You may play an additional land this turn.

({T}: Add {G}.)

Draw a card. You may put a land card from your hand onto the battlefield.

({T}: Add {U}.)

When this creature enters, put a +1/+1 counter on another target Merfolk you control.

This creature gets +1/+1 as long as you control another Merfolk or an Island.

Other Merfolk you control get +1/+1.

Flash

When this creature enters, tap target creature an opponent controls. It loses all abilities until end of turn.

This creature can't be blocked.

Whenever another Merfolk you control enters, this creature gets +1/+1 until end of turn.

This creature has flying as long as you control another Merfolk.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)

I, II — Until your next turn, creatures you control gain "{T}: Add one mana of any color."

III — Put a +1/+1 counter on each creature you control. Those creatures gain vigilance, trample, and indestructible until end of turn.

Landfall — Whenever a land you control enters, you gain 1 life and draw a card.

As this land enters, choose a creature type.

{T}: Add {C}.

{T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type.

When this creature enters, put a +1/+1 counter on each of up to two target Merfolk you control.

{T}: Add {C}. Spend this mana only to cast an instant or sorcery spell.

When Zegana enters, if you control another creature with a +1/+1 counter on it, draw a card.

{4}{G}{U}: Adapt 4. (If this creature has no +1/+1 counters on it, put four +1/+1 counters on it.)

Each creature you control with a +1/+1 counter on it has trample.