mtg custom proxy cards Snapcaster Mage The fonts open sourced and or properly commercially licensed Peacekeeper | Full Art Custom

You can also use cards like Eternal Witness and Timeless Witness in this slot as well

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Unlike instants though, they stick around afterwards and provide continuous effects

Play out a veritable army and give them haste right to deliver a crazy amount of damage

Additionally, there are select borderless manga cards available in Collector Booster Sample Packs that come with the Commander decks

Here's an answer that can handle almost any threat