Otaria Forever (Ideas): Virtual Booster

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This booster was generated with modern collation since the cardset contains mythics: 1 rare / mythic, 3 uncommons, 10 commons, 1 basic land.
You could alternatively have 15 random cards regardless of rarity.
 R 
Legendary Creature – Human
Synthesis – Whenever a counter is placed on a permanent you control, choose one: Flynn, Master Explorer deals 2 damage to target creature, add {g}{g} to your mana pool, or you gain 4 life.
3/4
 U 
Creature – Treefolk
When Sunland Seedsower enters the battlefield, distribute a number of essence counters amongst creatures equal to the number of Forests you control.
{t}, Remove an essence counter from Sunland Seedsower: Put a 1/1 green Saproling creature token onto the battlefield.
1/4
 U 
Creature – Human Druid Cleric
{2}{w}: Target creature you control gains protection from the color of your choice until end of turn.
"Serra will protect you if you put faith in her Word."
2/2
 U 
Creature – Dwarf Artificer
{1}{w}, {t}: Put an Armor equipment token onto the battlefield. It has "Sacrifice Armor: Prevent the next 1 damage that would be dealt to equipped creature this turn.
Equip {0}"
1/1
 C 
Creature – Human Cleric
{t}, Tap an untapped Human you control: Pray.
At the beginning of each end step, if Outpost Preacher prayed this turn, you gain 2 life.
2/2
 C 
Creature – Cephalid
When Cephalid Bonesifter enters the battlefield, put the top four cards of your library into your graveyard.
2/3
 C 
Sorcery
Gain control of target creature until end of turn. Untap that creature. It gains haste, trample and "{r}: This creature gets +1/+0 until end of turn" until end of turn.
 C 
Land
Sunlit Savanna enters the battlefield tapped.
When Sunlit Savanna enters the battlefield, put a growth counter on target creature you control.
{t}: Add {g} or {w} to your mana pool.
 C 
Creature – Cephalid Soldier
Prowess
Process 1 {1}{u} ({1}{u}, Exile this card from your graveyard: Put a colorless 0/1 Cephalid Spawn creature token onto the battlefield. It has "Sacrifice this creature: Add a counter of the type of your choice to target creature you control.")
3/2
 C 
Creature – Cephalid
Discard a card: Put a growth counter on Riptide Assistant, then you may transform Riptide Assistant.
1/1
Revered Scholar
 
 C 
Creature – Cephalid Wizard
{t}, Remove a growth counter from Revered Scholar: Draw a card.
1/1
 C 
Creature – Spirit
One with nothing (Grieving Banshee costs {c} less to cast for each face-down land used to pay its casting cost.)
Haste
2/2
 C 
Instant
Prevent all combat damage that would be dealt this turn.
Synthesis – If a counter was placed on a permanent you control this turn, then each attacking creature doesn't untap during its controller's next untap step.
 C 
Creature – Dwarf Warrior Cleric
Tithe (When a Human creature you control enters the battlefield with a growth counter on it, you may tap this creature. If you do, that creature comes into play with an additional growth counter on it.)
If you control a Plains, Dwarven Convert gets first strike.
The foothills echoed with the Song of Salvation, and those that were lost became found.
3/2
 C 
Sorcery
Search your library for a basic land card and put that card onto the battlefield tapped. Then shuffle your library. If that land was a Forest, you may put a growth counter on target creature you control.
Swamp
 
 B 
Basic Land – Swamp

Flynn, Master Explorer (rare)
Sunland Seedsower (uncommon)
Krosan Disciple (uncommon)
Devout Armorer (uncommon)
Outpost Preacher (common)
Cephalid Bonesifter (common)
Pardic Persuasion (common)
Sunlit Savanna (common)
Cephalid Sentry (common)
Riptide Assistant (common)
Grieving Banshee (common)
Erwen's Gaze (common)
Dwarven Convert (common)
Spread the Seeds (common)
Swamp (basic)