Deathleaper, Terror Weapon Ikoria gave us a bunch of cool keyword lords like Frondland Felidar and Quartzwood Crasher, and Deathleaper, Terror Weapon is basically your choice of haste or flash lord
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If the backup card enters with additional abilities or gains abilities with the backup trigger on the stack, those arent added to the targeted creature
Regularly review and adjust your deck based on performance, removing underperforming cards and testing new additions
Reflection of Kiki-Jiki can be very powerful, especially if youre running creatures with good ETB or death triggers
Sultai Reanimator and Golgari Midrange shells are the obvious homes, letting you set up your graveyard for a beefy recursion turn while your mana is otherwise occupied