Tideforce Elemental :2: :U:
Creature - Elemental Uncommon
:U:, :T:: You may tap or untap another target creature.
Landfall - Whenever a land enters the battlefield under your control, you may untap Tideforce Elemental.
2/1
Stone Idol Trap :5: :R:
Instant - Trap Rare
Stone Idol Trap costs :1: less to cast for each attacking creature.
Put a 6/12 colorless Construct artifact creature token with trample onto the battlefield. Exile it at the beginning of your next end step.
Harabaz Druid :1: :G:
Creature - Human Druid Ally Rare
:T:: Add X mana of any one color to your mana pool where X is the number of Allies you control.
0/1
Omnath, Locus of Mana :2: :G:
Legendary Creature - Elemental Mythic Rare
Green mana doesn't empty from your mana pool as phases and steps end.
Omnath, Locus of Mana gets +1/+1 for each green mana in your mana pool.
1/1
Raging Ravine
Land Rare
Raging Ravine enters the battlefield tapped.
:T:: Add :R: or :G: to your mana pool.
2 :R: :G:: Until end of turn, Raging Ravine becomes a 3/3 red and green Elemental creature with "Whenever this creature attacks, put a +1/+1 counter on it." It's still a land.