battle siege cards mtg type:battle (game:paper) · Scryfall Magic: The Gathering Search then cast it transformed.) When Invasion of Shandalar enters the battlefield Battle Mastery | Cardsphere Blog

You will likely have enough for two dual-element decks if you run 20 Sites per deck (below the current official minimum), but you probably wont have enough for a legal constructed deck with 30 Sites

"Alternate Chinese Art in Ravnica Part 1"

It will likely have a lot of non-creature spells with a mana cost of three or more and some ways to deal direct damage to enemy players

This could be the element youre looking for

Holding this up alongside countermagic leaves you with plenty of good options

Just like Eriette in Magics story used the Wicked Slumber to enchant sleepers into doing her bidding, this card allows you to use your opponents creatures against one another