If the table has been building resources for several turns, Valgavoths Onslaught converts yours into immediate pressure
Of the ones available, by far the best option is Sisay, Weatherlight Captain: our deck's goal is to quickly and consistently put all our shrines on to the battlefield and Sisay does exactly that, fetching any of our legendary shrines
It features highly in extra combat decks, which I had the rundown on last week
Triggered abilities (starting with "when," "whenever," or "at") are unaffected by Karn
At the beginning of your upkeep, if this enchantment has one or more wreck counters on it, remove a wreck counter from it and seek a nonland card
This is pretty great and an excellent outlet to spend your excess mana