
Prime Speaker Zegana | Legendary Creature | Merfolk Wizard | Prime Speaker Zegana enters the battlefield with X +1/+1 counters on it, where X is the greatest power among other creatures you control.
When Prime Speaker Zegana enters the battlefield, draw cards equal to its power. | Willian Murai

Merfolk of the Depths | Creature | Merfolk Soldier | Flash (You may cast this spell any time you could cast an instant.) | Scott Chou

Rubblehulk | Creature | Elemental | Rubblehulk's power and toughness are each equal to the number of lands you control.
Bloodrush — {1}{R}{G}, Discard Rubblehulk: Target attacking creature gets +X/+X until end of turn, where X is the number of lands you control. | Raymond Swanland

Ruination Wurm | Creature | Wurm | | Dave Kendall