Mega Venusaur EX requires 4x Energy to attack, but thats no pain thanks to Ivysaurs 1x Energy move, Synthesis, that brings 2 Energies to itself
Detaining a planeswalker does prevent it from activating any of its loyalty abilities
Kazandu Mammoth / Kazandu Valley Kazandu Mammoth is a beefy creature played in stompy decks, and together with fetch lands, you can have a 7/7 attacking on turn 4
Additionally, both Golem and its pre-evolution, Graveler, are resource-intensive, meaning Golem likely wont enter the battle until very late in the game when significant setup has been completed
Oubliette plays like a stronger Oblivion Ring, since it also phases out all auras and equipments on the creature it targets