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You can add a load of different colours for a variety of utility and redundancy and that is great
Whenever your opponent casts their first non-creature spell each turn, you may draw a card, unless your opponent pays X (where X is Esper Sentinel's power)
If that creature's power is 2 or less when it enters the battlefield but becomes greater than 2 after the ability triggers, the target creature will still get +1/+1 until end of turn
That solved two of my problems, and before long I was able to play out Gev, draw into Zulaport Cutthroat and tutor up an Ashnod's Altar, I happened to catch the table without interaction
Islandcycling doesnt just fix your mana, it fuels extra value with cards like Astral Drift or Drake Haven