It might be tempting to jack their Squire, but oftentimes the Elspeth is going to be a little scarier
Furthermore, things like fetch lands or cards like Spore Frog or Sakura-Tribe Elder that require them to be sacrificed will go straight to the Tergrid player when she's on the battlefield
Drannith Magistrate can easily become a target of the tables ire and it likely wont stick around for too long if your opponents all want it gone
There are many cards you want on the battlefield as soon as possible as they give protection that makes it much harder, if not impossible to remove your Voltron creature
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So, for example, if you cast Deadpool, Trading Card and trade text boxes with and opponent's Solemn Simulacrum, when Deadpool enters you'll get to fetch a basic land , and draw a card when he dies