Make sure you can sacrifice or kill the Zombie Army token each turn so Dreadhorde Invasion makes a new one instead of adding a counter to an existing one
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However, if it feels like someone is holding mass artifact removal, especially if someone at the table is begging to be hit this way, like a Shorikai, Genesis Engine deck, then maybe drop more creature threats and hold back a discard outlet and a bounce source while you keep dropping mana rocks and working to get your other titans in the deck out
Keeping a disruption-heavy hand can be acceptable, such as in Tron with multiple Oblivion Stones, but it is risky
Create a Sliver token and if youre not the monarch, become the monarch, then every subsequent Sliver that ETBs under your control pumps your Sliver board by 1