There is no way to make both abilities happen at the same time. Sacrificing the Elk is part of the cost of either of the abilities and you have to choose which to use.
may i recommend you using Viridian Emissary for that purpose since his ability triggers when he goes to the graveyard rather than having to sacrifice him to get the effect.
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may i recommend you using Viridian Emissary for that purpose since his ability triggers when he goes to the graveyard rather than having to sacrifice him to get the effect.