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But you can see where they were going with stuff like the Unearth mechanic

Blessing of Light At the beginning of combat on your turn, put two +1/+1 counters on another target creature you control

We can have The Lord of Pain target and damage us when an opponent casts their first spell to easily reduce the cost of Shadow of Mortality

A common dynamic in this situation is that a snow land produces snow mana, and a snow creature requires snow mana or uses snow mana for an ability

All of that is for two mana as well, meaning you can do this every turn from turn three onwards - or even earlier if you can generate the mana for it