A number of actions also cant be cancelled once selected (but before being executed), making it easy to accidentally force yourself to sacrifice monsters because you misunderstood exactly what a card or effect required
However, its actually perfectly sized to carry traditionally sized trading cards
If an effect allows an opponent to cast spells any time they could cast an instant (for example, if your opponent controls Teferi, Mage of Zhalfir), the restriction of Teferi's last ability takes precedence over that permission
Sideboard ideas The sideboard is the most obvious entry point to handling any problematic deck, and a lot of Burn answers fit nicely into your average Modern sideboard
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What sets it apart from other mana rocks is its ability to infinitely untap itself