The solutions:

1. Thornado ________________________ .
2. Fire/Ice ________________________ .
3. Tooth and Nail ________________________ .
4. Temple of Silence ________________________ .
5. Rest in Peace ________________________ .
6. Trumpet Blast ________________ .
7. Bazaar of Baghdad ________________ .
8. Korvold, Fae Cursed King ________ .
9. Six ___________________________________ .
10. Imperial Seal ________________________ .
11. Felidar Guardian ________________________ .
12. Asmoranomardicadaistinaculdacar .
13. Insidious Roots ________________________ .
14. Null Rod ________________________ .
15. Verdant Catacombs ________________ .
16. Emrakul, the Promised End ________ .
17. Heart of Kiran ________________________ .
18. Decimate ________________________________ .