Discarding a card to Rankle, Master of Pranks only matters if you have any left in hand to begin with
Legendary Creature - Wizard Merfolk Color tag templates(None) Keranos, God of Storms Indestructible As long as your devotion to blue and red is less than seven, Keranos isn't a creature
Sacrificing is part of its activation cost, so by the time the opponent gets priority, the goblin is not on the battlefield
That said, this set doesnt really favor three-color decks, and splashing a third color is usually only viable if you're playing greenwhich has slightly better mana fixing
Sagas are a fascinating card type: although they're a permanent like other enchantments, they have a fixed lifespan, and they have different effects from turn to turn
The second ability on Pippin can also be a massive game ender if you have enough creatures on the field