CardName: Treetop Reservoir
Cost:
Type: Land
Pow/Tgh: /
Rules Text: Treetop Reservoir enters the battlefield tapped.
{T}: Add {g} or {u} to your mana pool.
{4}{g}: Treetop Reservoir becomes a 5/4 green Elemental
creature until end of turn.
{2}{u}: Treetop Reservoir becomes a 2/2 blue elemental
creature with flying until end of turn.
Flavour Text:
Set/Rarity: Multiverse Design Challenge Rare
Treetop Reservoir
R
Land
Treetop Reservoir enters the battlefield tapped.
: Add or to your mana pool.
: Treetop Reservoir becomes a 5/4 green Elemental creature until end of turn.
: Treetop Reservoir becomes a 2/2 blue elemental creature with flying until end of turn.
: Add 
or 
to your mana pool.
See Challenge # 137. Inspired by Solid Thunderheads and Mercenary's Guildhouse.