Bog Witch

Atzocan Seer

{T}: Add one mana of any color.
Sacrifice this creature: Return target Dinosaur card from your graveyard to your hand.

Circle of Dreams Druid

{T}: Add {G} for each creature you control.

Accomplished Alchemist

{T}: Add one mana of any color.
{T}: Add X mana of any one color, where X is the amount of life you gained this turn.

Bloom Tender

{T}: For each color among permanents you control, add one mana of that color.

Bog Initiate

Apprentice Wizard

Centaur Nurturer

When this creature enters, you gain 3 life.
{T}: Add one mana of any color.

Citanul Hierophants

Creatures you control have "{T}: Add {G}."

Avacyn's Pilgrim

Boreal Druid

Canopy Tactician

Other Elves you control get +1/+1.
{T}: Add {G}{G}{G}.

Biophagus

Genomic Enhancement — {T}: Add one mana of any color. If this mana is spent to cast a creature spell, that creature enters with an additional +1/+1 counter on it.

Blightsoil Druid

Cormela, Glamour Thief

Haste
{1}, {T}: Add {U}{B}{R}. Spend this mana only to cast instant and/or sorcery spells.
When Cormela dies, return up to one target instant or sorcery card from your graveyard to your hand.

Copper Myr

Automated Artificer

{T}: Add {C}. Spend this mana only to activate an ability or cast an artifact spell.

Alloy Myr

Beastcaller Savant

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

Arixmethes, Slumbering Isle

Arixmethes enters tapped with five slumber counters on it.
As long as Arixmethes has a slumber counter on it, it's a land. (It's not a creature.)
Whenever you cast a spell, you may remove a slumber counter from Arixmethes.
{T}: Add {G}{U}.

Citanul Stalwart

{T}, Tap an untapped artifact or creature you control: Add one mana of any color.

Chandra's Embercat

{T}: Add {R}. Spend this mana only to cast an Elemental spell or a Chandra planeswalker spell.

Bighorner Rancher

Vigilance
{T}: Add an amount of {G} equal to the greatest power among creatures you control.
Sacrifice this creature: You gain life equal to the greatest toughness among other creatures you control.