Since it's a natural follow up question about the one ability per turn use of a planeswalker You can't activate a loyalty ability of Garruk Relentless and later that turn after he transforms activate a loyalty ability of Garruk, the Veil-Cursed
That said, if your deck does run Equipment, +1/+1 counter effects, or anthems, Esper Sentinels tax can get truly untenable, virtually guaranteeing you three or more cards per turn cycle
Legendary Creature - Human Assassin Chiss-Goria, Forge Tyrant Affinity for artifacts (This spell costs less to cast for each artifact you control.) Flying, haste Whenever Chiss-Goria attacks, exile the top five cards of your library
The real standout is Aurora, Holding Court, the card taking over Amber decks and allowing some great Princess and Queen options in the early game to help build the Princess deck meta.
and a way to find our Hydroid Krasis, Magus of the Candelabra, or Walking Ballista, depending on the situation
In micro cube, spells-matter should feel like a tempo-control deck with upside, not a dare