mtg elspeth cards Elspeth, Storm Slayer Proxy Escape4WW TDM] Elspeth card teaser :

If they do, you get it Zombified under your control

Youre already incentivized to run mass-damage effects like Thermo-Alchemist here, and a single Lightning Bolt can represent a 6- or 9-mana discount for the turn

Urabrask / The Great Work Storm wants you to cast a ton of spells in a single turn

I've also seen people write on basic lands to note the card (though this isn't allowed in tournaments)

The futuristic packs give you a chance to pull a saga or channel land

Anyway, Sinkholes ability to disrupt peoples mana before they can really even get their game going is good enough for Legacy and would be seriously problematic if the card was ever legal in Modern, let alone Standard